-
Write the structures of different
chain isomers of alkanes corresponding to the molecular formula, \[{{C}_{6}}{{H}_{14}}\].
Also write their IUPAC names.
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Write structures of different
isomeric alkyl groups corresponding to the molecular formula \[{{C}_{5}}{{H}_{11}}\]Write
IUPAC names of alcohols obtained by the attachment of OH groups at different
carbons of the chain.
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Write IUPAC names of the following compounds :
(i) \[{{(C{{H}_{3}})}_{3}}CC{{H}_{2}}C{{(C{{H}_{3}})}_{3}}\]
(ii) \[{{(C{{H}_{3}})}_{2}}C{{({{C}_{2}}{{H}_{5}})}_{2}}\]
(iii) Tetra-tert-butylmethane
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Write structural formulas of the following compounds :
(i) 3, 4, 4, 5-Tetramethylheptane
(ii) 2, 5-Dimethylhexane
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Write structures for each of the following compounds. Why
are the given names incorrect? Write correct IUPAC names.
(i) 2-Ethylpentane
(ii) 5-Ethyl-3-methylheptane
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Sodium salt of which acid will be needed
for the preparation of propane? Write chemical equation for the reaction.
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Write IUPAC names of the following compounds.
(i) \[{{(C{{H}_{3}})}_{2}}CH-CH=CH-C{{H}_{2}}-CH=CH-\underset{\underset{{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}}{\mathop{|}}\,}{\mathop{CH}}\,-C{{H}_{5}}\](ii)
(iii) \[{{H}_{2}}C=C{{(C{{H}_{2}}C{{H}_{2}}C{{H}_{3}})}_{2}}\]
(iv) \[C{{H}_{3}}-\overset{\overset{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}}{\mathop{|}}\,}{\mathop{C}}\,H-CH=\overset{\overset{C{{H}_{2}}C{{H}_{3}}}{\mathop{|}}\,}{\mathop{C}}\,-C{{H}_{2}}-\underset{\underset{C{{H}_{3}}}{\mathop{|}}\,}{\mathop{C}}\,H-C{{H}_{3}}\]
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Calculate number of sigma (\[\sigma
\]) and pi (\[\pi \]) bonds in
the above structures (i-iv).
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Write structures and IUPAC names
ofdifferent structural isomers of alkenes corresponding to\[{{C}_{5}}{{H}_{10}}\].
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-
Draw cis-
and trans-isomers of thefollowing compounds. Also write their IUPAC names:.
(i) \[CHCl=CHCl\]
(ii) \[{{C}_{2}}{{H}_{5}}CC{{H}_{3}}=CC{{H}_{3}}{{C}_{2}}{{H}_{5}}\]
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Which of the following compounds willshow cis-trans
isomerism?
(i) \[{{(C{{H}_{3}})}_{2}}C=CH-{{C}_{2}}{{H}_{5}}\]
(ii) \[{{H}_{2}}C=C\,B{{r}_{2}}\]
(iii) \[{{C}_{6}}{{H}_{5}}CH=CH-C{{H}_{3}}\]
(iv) \[C{{H}_{3}}CH=CClC{{H}_{3}}\]
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Write
IUPAC names of the productsobtained by addition reactions of \[HBr\]to
hex-1-ene.
(i) In presence of peroxide and
(ii) In the absence of peroxide.
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Write structures of different
isomers corresponding to the 5th member of alkyne series. Also write IUPAC
names of all the isomers. What type of isomerism is exhibited by different
pairs of isomers?
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How do you account for the
formation of ethane during chlorination of methane?
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-
Write the IUPAC names of the following compounds:
(a) \[C{{H}_{3}}CH=C{{(C{{H}_{3}})}_{2}}\]
(b) \[{{H}_{2}}C=CH-C\equiv C-C{{H}_{3}}\]
(c)
(d)
(e)
(f) \[C{{H}_{3}}{{(C{{H}_{2}})}_{4}}\underset{\underset{\text{C}{{\text{H}}_{\text{2}}}\text{-CH(C}{{\text{H}}_{\text{3}}}{{\text{)}}_{\text{2}}}}{\mathop{|}}\,}{\mathop{C}}\,H{{(C{{H}_{2}})}_{3}}C{{H}_{3}}\]
(g)\[{{H}_{3}}C-CH=CH-C{{H}_{2}}-CH=CH\] \[-\underset{\underset{{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\mathop{CH}}\,-C{{H}_{2}}-CH=C{{H}_{2}}\]
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For
the following compounds, write structural formulae and IUPAC names for all
possible isomershaving the number of double or triple bond as indicated:
(a) \[{{C}_{4}}{{H}_{8}}\] (one double bond)
(b) \[{{C}_{5}}{{H}_{8}}\] (one
triple bond)
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Write IUPAC names of the products obtained by the ozonolysis
of the following compounds:
(i) Pent-2-ene
(ii) 3, 4-Dimethylhept-3-ene
(ii) 2-Ethylbut-1-ene
(iv) 1-Phenylbut-1-ene
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An alkene 'A' on ozonolysis gives
a mixture of ethanal and pentan-3-one. Write structure and IUPAC name of 'A'.
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An alkene 'A' contains three C-C,
eight C-H \[\sigma \]bonds and one C-C \[\pi \] bond. 'A' on ozonolysis gives
two moles of an aldehyde of molar mass 44u. Write IUPAC name of 'A'.
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Propanal and pentan-3-one are the
ozonolysis products of an alkene? What is the structural formula of the alkene?
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-
Write chemical equations for the combustion reaction of the
following hydrocarbons:
(i) Butane (ii) Pentene (iii)
Hexyne (iv) Toluene
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-
Draw the cis and trans structures
of hex-2-ene. Which isomer will have higher b.p. and why?
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-
Why is benzene extra ordinarily
stable though it contains three double bonds?
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What are necessary conditions for
any system to be aromatic?
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Explain why the following systems are not aromatic?
(i)
(ii)
(iii)
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How will you convert benzene into:
(i) \[p-Nitrobromobenzene\]
(ii) \[m\]-Nitrochlorobenzene
(iii) \[p\]-Nitrotoluene
(iv) Acetophenone
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In
the alkane \[C{{H}_{3}}-C{{H}_{2}}-C{{(C{{H}_{3}})}_{2}}-C{{H}_{2}}-CH{{(C{{H}_{3}})}_{2}},\]
identify \[1{}^\circ ,\text{ }2{}^\circ ,\text{ }3{}^\circ \] carbon atoms and
give the
H-atoms bonded to each one of
these.
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What effect does branching of an
alkane chain hason its boiling point?
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-
Addition of \[HBr\] to propene yields 2-bromopropane, while
in the presence of benzoyl peroxide, the same reaction yields 1-bromopropane.
Explain and give mechanism.
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-
Write down the products of
ozonolysis of 1, 2-dimethylbenzene (o-xylene). How does the result support
Kekule structure of benzene?
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Arrange benzene, n-hexme and
ethyne in decreasing order of acidic behaviour. Also give reason for this
behaviour.
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Why does benzene undergo
electrophilic substitution reactions easily and nucleophilic substitutions with
difficulty?
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How would you convert the
following compounds into benzene: (i) Ethyne (ii) Ethene (iii) Hexane.
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-
Write structures of all the
alkenes which on hydrogenation give 2-methylbutane.
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Arrange the following set of compounds in order of their
decreasing relative reactivity with an electrophile,\[{{E}^{+}}\].
(a) Chlorobenzene, 2, 4-dinitrochlorobenzene, p-nitrochlorobenzene
(b) Toluene, \[p-{{H}_{3}}C-{{C}_{6}}{{H}_{4}}-N{{O}_{2}},\]
\[p-{{O}_{2}}N-{{C}_{6}}{{H}_{4}}-N{{O}_{2}}\]
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Out of benzene, m-dinitrobenzene
and toluene which will undergo nitration most easily and why?
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Suggest the name of a Lewis acid
other than anhydrous aluminium chloride which can be used during ethylation of
benzene.
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Why is Wurtz reaction not
preferred for the preparation of alkanes containing odd number of carbon atoms?
Illustrate your answer by taking one example.
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question_answer40)
Arrange the following in decreasing
order of their boiling points :
(A) n-butane (B)
2-methylbutane
(C) n-pentane (D)
2, 2-dimethylpropane
(a) \[A>B>C>D~\] (b)\[B>C>D>A\] (c)\[~D\text{
}>\text{ }C\text{ }>\text{ }B\text{ }>\text{ }A\] (d) \[C\text{
}>\text{ }B\text{ }>\text{ }D\text{ }>\text{ }A\]
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question_answer41)
Arrange the halogens \[{{F}_{2}},C{{l}_{2}},B{{r}_{2}},{{I}_{2}}\]in
order of their increasing reactivity with alkanes :
(a) \[{{I}_{2}}<B{{r}_{2}}<C{{l}_{2}}<{{F}_{2}}\] (b)
\[B{{r}_{2}}<C{{l}_{2}}<{{F}_{2}}<{{I}_{2}}\] (c) \[{{F}_{2}}<C{{l}_{2}}<B{{r}_{2}}<{{I}_{2}}\] (d)
\[B{{r}_{2}}<{{I}_{2}}<C{{l}_{2}}<{{F}_{2}}\]
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question_answer42)
The increasing order of
reduction of alkyl halides with zinc and dilute \[HCl\] is :
(a) \[R-Cl<R-I<R-Br\] (b)
\[B{{r}_{2}}<C{{l}_{2}}<{{F}_{2}}<{{I}_{2}}\]
(c)\[{{F}_{2}}<C{{l}_{2}}<B{{r}_{2}}<{{I}_{2}}\] (d)
\[B{{r}_{2}}<{{I}_{2}}<C{{l}_{2}}<{{F}_{2}}\]
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question_answer43)
The correct IUPAC name of the
following alkane is:
(a) 3, 6-diethyl-2-methyloctane (b)
5-isopropyl-3-ethyloctane
(c) 3-ethyl-5-isopropyloctane (d)
3-isopropyl-6-ethyloctane
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question_answer44)
The addition of \[HBr\]to
1-butene gives a mixture of products A, B and C.
\[\underset{(C)}{\mathop{C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-Br}}\,\]
The mixture consists of:
(a) A and B as major and C as
minor products (b) B as major, A and C as minor products
(c) B as minor, A and C as major
products (d) A and B as minor and C as major products
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question_answer45)
Which of the following will not
show geometrical isomerism?
(a) (b) (c) (d)
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question_answer46)
Arrange the following hydrogen
halides in order of their decreasing reactivity with propene:
(a) \[HCl>HBr>HI~~~~~\] (b)
\[HBr>HI>HCl\] (c)\[HI>HBr>HCl\] (d) \[HCl>HI>HBr\]
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question_answer47)
Arrange the following carbanions
in order of their decreasing stability :
(A) \[{{H}_{3}}C-C\equiv
{{C}^{-}}\] (B) \[H-C\equiv {{C}^{-}}\] (C) \[{{H}_{3}}C-CH_{2}^{-}\]
(a) \[A\text{ }>B>C~\] (b)\[B>A>C\] (c)
\[C\text{ }>\text{ }B\text{ }>\text{ }A\] (d) \[C>A>B\]
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question_answer48)
Arrange the following alkyl
halides in decreasing order of the rate of \[\beta \]-elimination reaction with
alcoholic KOH.
(A) \[{{H}_{3}}C-C\equiv
{{C}^{-}}\] (B) \[H-C\equiv {{C}^{-}}\] (C) \[{{H}_{3}}C-CH_{2}^{-}\]
(a) \[A>B>C\] (b)
\[C>B>A\] (c) \[B>C>A~~~~~~~~~~\] (d) \[A>C>B\]
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question_answer49)
Which of the following reactions
of methane is incomplete combustion?
(a) \[2C{{H}_{4}}+{{O}_{2}}\xrightarrow{Cu/523K/100atm.}2C{{H}_{3}}OH\] (b)
\[C{{H}_{4}}+{{O}_{2}}\xrightarrow{M{{o}_{2}}{{O}_{3}}}HCHO+{{H}_{2}}O\]
(c) \[C{{H}_{4}}+{{O}_{2}}\xrightarrow{{}}C(s)+2{{H}_{2}}O(l)\] (d)
\[C{{H}_{4}}+2{{O}_{2}}\xrightarrow[{}]{{}}C{{O}_{2}}(g)+2{{H}_{2}}O(l)\]
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question_answer50)
Some oxidation reactions of
methane are given below. Which of them is/are controlled oxidation reactions?
(a) \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\xrightarrow{{}}C{{O}_{2}}(g)+2{{H}_{2}}O(l)\] (b)
\[C{{H}_{4}}+{{O}_{2}}(g)\xrightarrow[{}]{{}}C(s)+2{{H}_{2}}O(l)\]
(c) \[C{{H}_{4}}(g)+{{O}_{2}}(g)\xrightarrow{M{{o}_{2}}{{O}_{3}}}HCHO+{{H}_{2}}O\] (d)
\[2C{{H}_{4}}(g)+{{O}_{2}}(g)\xrightarrow{Cu/523k/100atm.}2C{{H}_{3}}OH\]
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question_answer51)
Which of the following alkenes
on ozonolysis give a mixture of ketones only?
(a) \[C{{H}_{3}}-CH=CH-C{{H}_{3}}\] (b)
\[C{{H}_{3}}-\underset{\underset{\text{C}{{\text{H}}_{\text{3}}}}{\mathop{|}}\,}{\mathop{CH}}\,-CH=C{{H}_{3}}\]
(c) (d)
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question_answer52)
Which are the correct IUPAC
names of the following compound?
\[{{H}_{3}}C-C{{H}_{2}}C{{H}_{2}}\overset{\overset{\text{HC(C}{{\text{H}}_{\text{3}}}{{\text{)}}_{\text{2}}}}{\mathop{|}}\,}{\mathop{C}}\,H\underset{\underset{{{\text{H}}_{\text{3}}}\text{C-CH-C}{{\text{H}}_{\text{2}}}\text{C}{{\text{H}}_{\text{3}}}}{\mathop{|}}\,}{\mathop{C}}\,{{H}_{2}}C{{H}_{2}}C{{H}_{2}}-C{{H}_{3}}\]
(a) 5-Butyl-4-isopropyldecane (b)
5-Ethyl-4-propyldecane
(c) 5-sec-Butyl-4-iso-propyldecane (d)
4-(1-methylethyl)-5\[-(\text{ }1\text{ }methylpropyl)\]decane
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question_answer53)
Which are the correct IUPAC
names of the following compound?
\[{{H}_{3}}C-C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}-\underset{\underset{\underset{\underset{{{H}_{3}}C-\underset{\underset{C{{H}_{3}}}{\mathop{|}}\,}{\mathop{C}}\,-C{{H}_{3}}}{\mathop{|}}\,}{\mathop{\text{C}{{\text{H}}_{\text{2}}}}}\,}{\mathop{|}}\,}{\mathop{CH}}\,-C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}-C{{H}_{3}}\]
(a)
5-(2?, 2?-Dimethylpropyl)-decane (b) 4-Butyl-2, 2-dimethylnonane
(c) 2,2-Dimethyl-4-pentyloctane (d)
5-neo-Pentyldecane
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question_answer54)
For an electrophilic
substitution reaction, the presence of a halogen atom in the benzene ring
......... .
(a) deactivates the ring by
inductive effect
(b) deactivates the ring by
resonance
(c) increases the charge density
at ortho and para positions relative to meta position by resonance
(d) directs the incoming
electrophile to meta position by increasing the charge density relative to
ortho and para positions
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question_answer55)
In an electrophilic substitution
reaction of nitrobenzene, the presence of nitro group..........
(a) deactivates the ring by
inductive effect
(b) activates the ring by
inductive effect
(c) decreases the charge density
at ortho and para positions of the ring relative to meta position by resonance
(d) increases the charge density
at meta position relative to the ortho and para positions of the ring by
resonance
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question_answer56)
Which of the following are
correct?
(a)\[C{{H}_{3}}-O-CH_{2}^{\oplus
}\] is more stable than \[C{{H}_{3}}-CH_{2}^{\oplus
}\]
(b) \[{{(C{{H}_{3}})}_{2}}C{{H}^{\oplus
}}\]is less stable than \[C{{H}_{3}}-C{{H}_{2}}-CH_{2}^{\oplus }\]
(c) \[C{{H}_{2}}=CH-CH_{2}^{\oplus
}\]is more stable than \[C{{H}_{3}}C{{H}_{2}}CH_{2}^{\oplus }\]
(d) \[C{{H}_{2}}=C{{H}^{\oplus
}}\]is more stable than \[C{{H}_{3}}-CH_{2}^{\oplus }\]
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question_answer57)
Four structures are given in
options (a) to (d). Examine them and select the aromatic structures :
(a) (b)
(c) (d)
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question_answer58)
The molecules having dipole
moment are..........
(a) 2, 2-Dimethylpropane (b)
trans-Pent-2-ene
(c) cis-Hex-3-ene (d)
2, 2, 3, 3-Tetramethylbutane
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question_answer59)
Why do alkenes prefer to undergo
electrophilic addition reaction while arenes prefer electrophilic substitution reactions?
Explain.
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question_answer60)
Alkynes on reduction with sodium
in liquid ammonia for mirons alkenes. Will the butene thus formed on reduction
of 2-butyne show the geometrical isomerism?
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question_answer61)
Rotation around carbon-carbon
single bond of ethane is not completely free. Justify the statement.
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question_answer62)
Draw Newman and Sawhorse
projections for the eclipsed and staggered conformations of ethane. Which of
these conformations is more stable and why?
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question_answer63)
The intermediate carbocation
formed in the reactions of \[HI,\text{ }HBr\]and \[HCl\] with propene is the
same and the bond energy of \[HCl,HBr\]and \[HI\] is\[430.5\text{
}kJmo{{l}^{-1}}\], \[363.7\text{ }kJmo{{l}^{-1}}\]and\[296.8\text{
}kJmo{{l}^{-1}}\]respectively. What will be the order of reactivity of these
halogen acids?
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question_answer64)
What will be the product
obtained as a result of the following reaction and why?
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question_answer65)
How will you convert benzene
into :
(i) \[p-nitrobromobenzene\]
(ii) \[m-nitrobromobenzene?\]
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question_answer66)
Arrange the following set of
compounds in the order of their decreasing relative reactivity with an
electrophile.
Give reason.
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question_answer67)
Despite their \[-I\] effect, halogens
are \[o-\]and \[p\]-directing in haloarenes. Explain.
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question_answer68)
Why does presence of a nitro
group make the benzene ring less reactive in comparison to the unsubstituted
benzene ring? Explain.
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question_answer69)
Suggest a route for the
preparation of nitrobenzene starting from acetylene.
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question_answer70)
Predict the major product(s) of
the following reactions and explain their formation.
\[{{H}_{3}}C-CH=C{{H}_{2}}\xrightarrow[HBr]{{{(Ph-COO)}_{2}}}\]
\[{{H}_{3}}C-CH=C{{H}_{2}}\xrightarrow{HBr}\]
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question_answer71)
Nucleophiles and electrophiles
are reaction intermediate shaving electron rich and electron deficient centres respectively.
Hence, they tend to attack electron deficient and electron rich centres
respectively. Classify the following species as electrophiles and nucleophiles.
(i) \[{{H}_{3}}C{{O}^{-}}\] (ii)\[{{H}_{3}}C-\overset{\overset{\text{O}}{\mathop{||}}\,}{\mathop{C}}\,-{{O}^{-}}\]
(iii) \[\overset{\centerdot }{\mathop{Cl}}\,\] (iv)
\[C{{l}_{2}}C_{\centerdot }^{\centerdot }\]
(v) \[{{({{H}_{3}}C)}_{3}}{{C}^{+}}\] (vi)
\[B{{r}^{-}}\] (vii) \[{{H}_{3}}COH\] (viii) \[R-NH-R\]
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question_answer72)
The relative reactivity of \[1{}^\circ
,\text{ }2{}^\circ ,\text{ }3{}^\circ \]hydrogen's towards chlorination is 1:
3.8: 5. Calculate the percentages of all mono chlorinated products obtained
from 2-methylbutane.
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question_answer73)
Write the structures and names
of products obtained in the reactions of sodium with a mixture of 1-iodo-2-methylpropane
and 2-iodopropane.
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question_answer74)
Write hydrocarbon radicals that
can be formed as intermediates during mono chlorination of 2-methyl-propane?
Which of them is more stable? Give reasons.
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question_answer75)
An alkane \[{{C}_{8}}{{H}_{18}}\]
is obtained as the only product on subjecting a primary alkyl halide to Wurtz
reaction. On monobromination this alkane yields a single isomer of a tertiary
bromide. Write the structure of alkane and the tertiary bromide.
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question_answer76)
The ring systems having
following characteristics are aromatic.
(i) Planar ring containing
conjugated \[\pi \]-bonds.
(ii) Complete delocalization of
the \[\pi \]-electrons in ring system, i.e., each atom in the ring has
unhybridised p-orbital and
(iii) Presence of (4n + 2)\[\pi
\]-electrons in the ring where n is an integer (n = 0, 1, 2,......) (Huckel?s
rule).
Using this information classify
the following compounds as aromatic/non aromatic.
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question_answer77)
Which of the following compounds
are aromatic according to Huckel?s rule?
(a) (b)
(c) (d)
(e) (f)
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question_answer78)
Suggest a route to prepare ethyl
hydrogen sulphate\[(C{{H}_{3}}-C{{H}_{2}}-OS{{O}_{2}}-OH)\]starting from ethanol\[({{C}_{2}}{{H}_{5}}OH)\].
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question_answer79)
Match the reagent from Column I which
on reaction with\[C{{H}_{3}}CH=C{{H}_{2}}\]gives some product given in Column
II as per the codes given below :
Column I
|
Column II
|
(i) \[{{O}_{3}}/Zn+{{H}_{2}}O\]
|
(a) Acetic acid and \[C{{O}_{2}}\]
|
(ii) \[KMn{{O}_{4}}/{{H}^{+}}\]
|
(b) Propan-1-ol
|
(iii) \[KMn{{O}_{4}}/O{{H}^{-}}\]
|
(c) Propan-2-ol
|
(iv) \[{{H}_{2}}O/{{H}^{+}}\]
|
(d) Acetaldehyde and formaldehyde
|
(v) \[{{B}_{2}}{{H}_{6}}/NaOH\]and \[{{H}_{2}}{{O}_{2}}\]
|
(e) Propane-1,2-diol
|
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question_answer80)
Match the hydrocarbons in Column
I with the boiling points given in Column II.
Column I
|
Column II
|
(i) \[n-Pentane\]
|
(a)\[282.5K\]
|
(ii) \[iso-\text{Pentane}\]
|
(b) \[309K\]
|
(iii) \[neo-\text{Pentane}\]
|
(c) \[301K\]
|
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question_answer81)
Match the following reactants in
Column I with the corresponding reaction products in Column II.
Column I
|
Column II
|
(i) Benzene \[+C{{l}_{2}}\xrightarrow{AlC{{l}_{3}}}\]
|
(a) Benzoic acid
|
(ii) Benzene \[+C{{H}_{3}}Cl\xrightarrow{AlC{{l}_{3}}}\]
|
(b) Methyl phenyl ketone
|
(iii) Benzene\[+C{{H}_{3}}COCl\xrightarrow{AlC{{l}_{3}}}\]
|
(c) Toluene
|
(iv) Toluene \[+\xrightarrow{KMn{{O}_{4}}/NaOH}\]
|
(d) Chlorobenzene
|
|
(e) Benzene hexachloride
|
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question_answer82)
Match the reactions given in
Column I with the reaction types in Column II.
Column I
|
Column II
|
(i) \[{{H}_{2}}C=C{{H}_{2}}+{{H}_{2}}O\xrightarrow{{{H}^{+}}}\]\[C{{H}_{3}}C{{H}_{2}}OH\]
|
(a) Hydrogenation
|
(ii) \[{{H}_{2}}C=C{{H}_{2}}+{{H}_{2}}\xrightarrow{Pd}\]\[C{{H}_{3}}-C{{H}_{3}}\]
|
(b) \[\text{Halogenation}\]
|
(iii) \[{{H}_{2}}C=C{{H}_{2}}+C{{l}_{2}}\xrightarrow{{}}\]\[ClC{{H}_{2}}C{{H}_{2}}Cl\]
|
(c) \[\text{Polymerisation}\]
|
(iv) \[3HC\equiv CH\xrightarrow[\Delta ]{Cu\,tube}{{C}_{6}}{{H}_{6}}\]
|
(d) \[Hydration\]
|
|
(e) \[Condensation\]
|
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question_answer83)
In the following questions a
statement of Assertion (A) followed by a statement of Reason (R) is given.
Choose the correct option out of the choices given below:
(a) If both A and R
are correct and R is the correct explanation of the A.
(b) If both A and R
are correct but R is not the correct explanation of the A.
(c) If A is correct but R
is incorrect.
(d) If A is incorrect but
R is correct.
(A) The compound
cyclooctene has the following structural formula :
It is cyclic and has conjugated \[8\pi
\]-electron system but it is not an aromatic compound.
(R)\[(4n+2)\pi \]-
electrons rule does not hold good and ring is not planar.
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question_answer84)
(A) Toluene on
Friedel-Crafts methylation gives o- and p-xylene.
(R) \[C{{H}_{3}}\] ?group
bonded to benzene ring increases electron density at o- and p-positions.
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question_answer85)
(A) Nitration of benzene
with nitric acid requires the use of concentrated sulphuric acid.
(R) The mixture of
concentrated sulphuric acid and concentrated nitric acid produces the
electrophile, \[NO_{2}^{+}\].
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question_answer86)
(A) Among isomeric
pentanes, 2,2-dimethylpropane has lowest boiling point.
(R) Branching does not
affect the boiling point.
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question_answer87)
An alkyl halide \[{{C}_{5}}{{H}_{11}}Br(A)\]Br
(A) reacts with ethanolic KOH to give an alkene ?B? which reacts with \[B{{r}_{2}}\]
to give a compound 'C?, which on dehydrobromination gives an alkyne 'D?. On
treatment with sodium metal in liquid ammonia one mole of 'D? gives one mole of
the sodium salt of 'D? and half a mole of hydrogen gas. Complete hydrogenation
of 'D' yields a straight chain alkane. Identify A, B, C and D. Give the
reactions involved.
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question_answer88)
An unsaturated hydrocarbon 'A'
adds two molecules of \[{{H}_{2}}\]and on reductive ozonolysis gives butane-1,4-dial,
ethanol and propanone. Give the structure of 'A', write its IUPAC name and
explain the reactions involved.
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question_answer89)
In the presence of peroxide addition of \[HBr\]to
propene takes place according to anti Markownikoffs rule but peroxide effect is
not seen in the case of \[HCl\] and \[HI\]. Explain.
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