-
question_answer1)
The conversion of benzene diazonium chloride to bromobenzene can be accomplished by
A)
Reimer-Tiemann reaction done
clear
B)
Friedel-Crafts reaction done
clear
C)
Gattermann reaction done
clear
D)
Azo-Coupling reaction done
clear
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question_answer2)
\[{{C}_{7}}{{H}_{9}}N\] has how many isomeric forms that contain a benzene ring?
A)
4 done
clear
B)
5 done
clear
C)
6 done
clear
D)
7 done
clear
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question_answer3)
The amine that does not react with acetyl chloride is
A)
\[C{{H}_{3}}N{{H}_{2}}\] done
clear
B)
\[{{(C{{H}_{3}})}_{2}}NH\] done
clear
C)
\[{{(C{{H}_{3}})}_{3}}N\] done
clear
D)
None of these done
clear
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question_answer4)
In the diazotisation of arylamines with sodium nitrite and hydrochloric acid, an excess of hydrochloric acid is used primarily to
A)
supress the concentration of free aniline available for coupling done
clear
B)
supress hydrolysis of phenol done
clear
C)
ensure a stoichiometric amount of nitrous acid done
clear
D)
neutralise the base liberated done
clear
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question_answer5)
Nitrosoamines \[({{R}_{2}}N-N=O)\] are insoluble in water. On heating with conc. \[{{H}_{2}}S{{O}_{4}}\], they give secondary amines. The reaction is called
A)
Liebermann nitroso reaction done
clear
B)
Etard reaction done
clear
C)
Fries reaction done
clear
D)
Perkin reaction done
clear
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question_answer6)
Aniline reacts with phosgene and KOH to form
A)
B)
C)
D)
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question_answer7)
In a reaction of aniline a coloured product C was obtained.
The structure of C would be:
A)
B)
C)
D)
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question_answer8)
Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound if water during the reaction is continuously removed. The compound formed is generally known as
A)
an amine done
clear
B)
an imine done
clear
C)
an enamine done
clear
D)
a Schiff's base done
clear
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question_answer9)
The alkene formed as a major product in the above elimination reaction is
A)
B)
C)
D)
\[C{{H}_{2}}=C{{H}_{2}}\] done
clear
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question_answer10)
Product [B] in this reaction is:
A)
B)
C)
D)
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question_answer11)
p-Chloroaniline and anilinium hydrogen chloride can be distinguished by:
A)
Sandmeyer reaction done
clear
B)
Carbyiamine reaction done
clear
C)
Hinsberg's reaction done
clear
D)
\[AgN{{O}_{3}}\] done
clear
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question_answer12)
Consider the following sequence of reactions:
\[Compound\left[ A \right]\xrightarrow{Reduction}\left[ B \right]\]\[\xrightarrow{HN{{O}_{2}}}C{{H}_{3}}C{{H}_{2}}OH\] The compound [A] is |
A)
\[C{{H}_{3}}C{{H}_{2}}CN\] done
clear
B)
\[C{{H}_{3}}N{{O}_{2}}\] done
clear
C)
\[C{{H}_{3}}NC\] done
clear
D)
\[C{{H}_{3}}CN\] done
clear
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question_answer13)
What will be the final product in the following reaction sequence? \[C{{H}_{3}}C{{H}_{2}}CN\xrightarrow{{{H}^{+}}/{{H}_{2}}O}A\xrightarrow[\Delta ]{N{{H}_{3}}}B\] \[\xrightarrow{NaOBr}C\]
A)
\[C{{H}_{3}}C{{H}_{2}}CON{{H}_{2}}\] done
clear
B)
\[C{{H}_{3}}C{{H}_{2}}COBr\] done
clear
C)
\[C{{H}_{3}}C{{H}_{2}}N{{H}_{2}}\] done
clear
D)
\[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}N{{H}_{2}}\] done
clear
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question_answer14)
\[C{{H}_{3}}-C{{H}_{2}}C\equiv N\xrightarrow{X}C{{H}_{3}}C{{H}_{2}}CHO\]. The compound X is
A)
\[SnC{{l}_{2}}/HCl/{{H}_{2}}O,boil\] done
clear
B)
\[{{H}_{2}}/Pd-BaS{{O}_{4}}\] done
clear
C)
\[LiAI{{H}_{4}}/ether\] done
clear
D)
\[NaB{{H}_{4}}/ether/{{H}_{3}}{{O}^{+}}\] done
clear
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question_answer15)
Tautomerism will be exhibited by
A)
\[{{(C{{H}_{3}})}_{3}}CNO\] done
clear
B)
\[{{(C{{H}_{3}})}_{2}}NH\] done
clear
C)
\[{{R}_{3}}CN{{O}_{2}}\] done
clear
D)
\[RC{{H}_{2}}N{{O}_{2}}\] done
clear
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question_answer16)
Hydrolysis of \[C{{H}_{2}}C{{H}_{2}}N{{O}_{2}}\] with 85% \[{{H}_{2}}S{{O}_{\text{4}}}\]gives
A)
\[C{{H}_{3}}C{{H}_{2}}OH\] done
clear
B)
\[{{C}_{2}}{{H}_{6}}\] done
clear
C)
\[C{{H}_{3}}CH=NOH\] done
clear
D)
\[C{{H}_{3}}COOH\] done
clear
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question_answer17)
Towards electrophilic substitution, the most reactive will be
A)
Nitrobenzene done
clear
B)
Aniline done
clear
C)
Aniline hydrochloride done
clear
D)
N-Acetylaniline done
clear
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question_answer18)
3, 5-dibromotoluene can be best synthesised by
A)
B)
C)
D)
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question_answer19)
Which of the following compounds is an enamine?
A)
B)
C)
D)
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question_answer20)
Which of the following reactions will not give N, N- dimethyl benzamide?
A)
B)
C)
D)
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question_answer21)
The product-(C) obtained in the following sequence of reactions is
A)
B)
C)
D)
None of these done
clear
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question_answer22)
Which of the following reagents will be useful to distinguish between
A)
Dilute \[HCl\] done
clear
B)
\[{{C}_{6}}{{H}_{5}}S{{O}_{2}}\] and \[O{{H}^{+}}/{{H}_{2}}O\] done
clear
C)
\[HONO\] then \[\beta \]-naphthol done
clear
D)
\[AgN{{O}_{3}}\] in \[{{H}_{2}}O\] done
clear
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question_answer23)
Which of the following is the strongest base?
A)
B)
C)
D)
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question_answer24)
The cyclobutyl methylamine with nitrous acid gives
A)
B)
C)
D)
All of these done
clear
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question_answer25)
Which of the following amines will react with cyclohexanone to give enamine?
A)
\[{{(C{{H}_{3}})}_{2}}NH\] done
clear
B)
C)
D)
All of these done
clear
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question_answer26)
In the reaction shown below, the major product(s) formed is/are
A)
B)
C)
D)
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question_answer27)
In the following reactions, the major product W is
A)
B)
C)
D)
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question_answer28)
In the following reactions, the product S is
A)
B)
C)
D)
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question_answer29)
In the reaction, \[C{{H}_{3}}CN+2H\xrightarrow{{}}X\xrightarrow{Boiling\,{{H}_{2}}O}\text{Y},\] the Term Y is
A)
acetone done
clear
B)
ethanamine done
clear
C)
acetaldehyde done
clear
D)
dimethylamine done
clear
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question_answer30)
In the reaction \[{{C}_{6}}{{H}_{5}}N{{H}_{2}}+C{{S}_{2}}\xrightarrow[\Delta ]{HgC{{l}_{2}}}\] the product obtained is
A)
phenyl isocyanide done
clear
B)
phenyl cyanide done
clear
C)
p-Simmo benzene sulphonic acid done
clear
D)
phenyl isothiocyanate done
clear
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question_answer31)
Arrange the following amines in the order of increasing basicity.
A)
B)
C)
D)
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question_answer32)
The final product formed when Methyl amine is treated with \[NaN{{O}_{2}}\] and \[HCl\] is:
A)
Diazomethane done
clear
B)
Methylalcohol done
clear
C)
Methylcyanide done
clear
D)
Nitromethane done
clear
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question_answer33)
The order of basicity of amines in gaseous state is:
A)
\[1{}^\circ >2{}^\circ >3{}^\circ >N{{H}_{3}}\] done
clear
B)
\[3{}^\circ >2{}^\circ >N{{H}_{3}}>1{}^\circ \] done
clear
C)
\[3{}^\circ >2{}^\circ >1{}^\circ >N{{H}_{3}}\] done
clear
D)
\[N{{H}_{3}}>1{}^\circ >2{}^\circ >3{}^\circ \] done
clear
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question_answer34)
Carbylamine forms from aliphatic or aromatic primary amine via which of the following intermediates?
A)
Carbanion done
clear
B)
Carbene done
clear
C)
Carbocation done
clear
D)
Carbon radical done
clear
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question_answer35)
The most basic compound among the following is
A)
Acetanilide done
clear
B)
Benzylamine done
clear
C)
p-Nitro aniline done
clear
D)
Aniline done
clear
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question_answer36)
Which of the following compounds gives dye test?
A)
Aniline done
clear
B)
Methylamine done
clear
C)
Diphenylamine done
clear
D)
Ethylamine done
clear
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question_answer37)
Acetanilide on nitration followed by alkaline hydrolysis mainly gives
A)
o-Nitroacetanilide done
clear
B)
p-Nitroamlme done
clear
C)
m-Nitroaniline done
clear
D)
2, 4, 6-Trinitroamline done
clear
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question_answer38)
What is X?
A)
B)
C)
D)
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question_answer39)
Which reaction sequence would be best to prepare 3-chloroanilne from benzene?
A)
Chlorination, nitration, reduction done
clear
B)
Nitration, chlorination, reduction done
clear
C)
Nitration, reduction, chlorination done
clear
D)
Nitration, reduction, acetylation, chlorination, hydrolysis done
clear
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question_answer40)
A compound 'A' when treated with \[HN{{O}_{3}}\] (in presence of \[{{H}_{2}}S{{O}_{4}}\]) gives compound 'B' which is then reduced with Sn and \[HCl\] to aniline? The compound 'A' is
A)
toluene done
clear
B)
benzene done
clear
C)
ethane done
clear
D)
acetamide done
clear
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question_answer41)
An organic compound [A] on reduction gives compound [B]. [B] on treatment with \[CHC{{l}_{3}}\] and alcoholic KOH gives [C]. [C] on catalytic reduction gives N-methylaniline. The compound A is
A)
Methylamine done
clear
B)
Nitromethane done
clear
C)
Aniline done
clear
D)
Nitrobenzene done
clear
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question_answer42)
Predict about the relative boiling point of the following two amines.
A)
Boiling point of I > II done
clear
B)
Boiling point of II > I done
clear
C)
Both should have equal boiling points done
clear
D)
It can't be predicted done
clear
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question_answer43)
Which statement is true regarding the following structure?
A)
it is a chiral molecule done
clear
B)
It exists in two resolvable optically active forms done
clear
C)
Both [a] and [b] done
clear
D)
Neither [a] nor [b] done
clear
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question_answer44)
Which one of the following is not an oxidation product of a primary amine?
A)
A hydroxylamine done
clear
B)
A nitroso compound done
clear
C)
A nitro compound done
clear
D)
All of these done
clear
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question_answer45)
Identify Z in the following sequence of reactions- \[C{{H}_{3}}COON{{H}_{4}}\xrightarrow{\Delta }X\xrightarrow{{{P}_{2}}{{O}_{5}}}Y\] \[\xrightarrow{{{H}_{2}}O/H}Z\]
A)
\[C{{H}_{3}}-C{{H}_{2}}-CO-N{{H}_{2}}\] done
clear
B)
\[C{{H}_{3}}-CN\] done
clear
C)
\[{{(C{{H}_{3}}CO)}_{2}}O\] done
clear
D)
\[C{{H}_{3}}-COOH\] done
clear
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question_answer46)
The order of basicity of the compounds
A)
IV>I>III>II done
clear
B)
I>III>II>IV done
clear
C)
III>I>IV>II done
clear
D)
II>I>III>IV done
clear
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question_answer47)
Complete reduction of benzene-diazonium chloride with \[Zn/HCl\] gives:
A)
Aniline done
clear
B)
Phenylhydrazine done
clear
C)
Azobenzene done
clear
D)
Hydrazobenzene done
clear
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question_answer48)
Conversion of benzene diazonium chloride to chlorobenzene is an example of which of the following reactions?
A)
Claisen done
clear
B)
Friedel-craft done
clear
C)
Sandmeyer done
clear
D)
Wurtz done
clear
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question_answer49)
In a set of reactions p-nitrotoluene yielded a product E.
The product E would be:
A)
B)
C)
D)
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question_answer50)
Which of the following will produce isopropyl amine- |
(I) \[{{(C{{H}_{3}})}_{2}}CO\xrightarrow{N{{H}_{2}}OH}X\xrightarrow{LiAl{{H}_{4}}}\] |
(II) \[C{{H}_{3}}-C{{H}_{2}}-CHO\xrightarrow[heat]{N{{H}_{3}}}X\xrightarrow{LiAl{{H}_{4}}}\] |
(III) \[{{(C{{H}_{3}})}_{2}}CH-OH+PC{{l}_{5}}\xrightarrow{{}}X\xrightarrow{N{{H}_{3}}}\] |
(IV) \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}+N{{H}_{2}}\xrightarrow{heat}\] |
A)
I, II done
clear
B)
II, III done
clear
C)
I, III done
clear
D)
IV only done
clear
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question_answer51)
Acetaldoxime reacts with \[{{P}_{2}}{{O}_{5}}\] to give
A)
Methyl cyanide done
clear
B)
Methyl cyanate done
clear
C)
Ethyl cyanide done
clear
D)
None of these done
clear
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question_answer52)
Identify the prdouct C in the series \[C{{H}_{3}}CN\xrightarrow{Na/{{C}_{2}}{{H}_{5}}OH}A\xrightarrow{HN{{\text{O}}_{2}}}B\] \[\xrightarrow{Cu/573K}C\]
A)
\[C{{H}_{3}}COOH\] done
clear
B)
\[C{{H}_{2}}C{{H}_{2}}NHOH\] done
clear
C)
\[C{{H}_{3}}CON{{H}_{2}}\] done
clear
D)
\[C{{H}_{3}}CHO\] done
clear
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question_answer53)
An organic compound "A" having molecular formula \[{{C}_{2}}{{H}_{3}}N\] on reduction gave another compound 'B' Upon treatment with nitrous acid, 'B' gave ethyl alcohol. On warming with chloroform and alcoholic KOH, B formed an offensive smelling compound 'C'. The compound 'C' is
A)
\[C{{H}_{3}}C{{H}_{2}}N{{H}_{2}}\] done
clear
B)
\[C{{H}_{3}}C{{H}_{2}}N\vec{=}C\] done
clear
C)
\[C{{H}_{3}}C\equiv N\] done
clear
D)
\[C{{H}_{2}}C{{H}_{2}}OH\] done
clear
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question_answer54)
Ethyl isocyanide on hydrolysis in acidic medium generates
A)
propanoic acid and ammonium salt done
clear
B)
ethanoic acid and ammonium salt done
clear
C)
methylamine salt and ethanoic acid done
clear
D)
ethylamine salt and methanoic acid done
clear
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question_answer55)
Primary nitro compounds react with nitrous acid to form nitrolic acids which dissolve in \[NaOH\]giving
A)
yellow solution done
clear
B)
blue solution done
clear
C)
colourless solution done
clear
D)
red solution done
clear
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question_answer56)
What is the product of the following series of reactions?
A)
B)
C)
D)
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question_answer57)
The starting reagents needed to make the azo compound shown below
A)
B)
C)
D)
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question_answer58)
Which of the following does not give N-ethyl cyclopentylamine as major product?
A)
B)
C)
D)
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question_answer59)
Match the compounds in List I with their nature from List II, as seen in aqueous medium
List I |
List II |
I. Acetamide |
A. Acidic |
II. Benzonitrile |
B. Basic |
III. Triethylamine |
C. Neutral |
IV. Phenol |
|
A)
I-C; II-C; III-B; IV-A done
clear
B)
I-B; II-C; III-C; IV-A done
clear
C)
I-C; II-B; III-B; IV-C done
clear
D)
I-A; II-A; III-C; IV-B done
clear
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question_answer60)
The correct order of basicities of the following compounds is
(1) |
(2)\[C{{H}_{3}}-C{{H}_{2}}-N{{H}_{2}}\] |
(3)\[{{(C{{H}_{3}})}_{2}}NH\] |
(4)\[C{{H}_{3}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-N{{H}_{2}}\] |
A)
2>1>3>4 done
clear
B)
1>3>2>4 done
clear
C)
3>1>2>4 done
clear
D)
1>2>3>4 done
clear
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question_answer61)
In the following reaction, X is \[X\xrightarrow{Bromination}Y\xrightarrow{NaN{{O}_{2}}/HCl}\] \[Z\xrightarrow[{{C}_{2}}{{H}_{5}}OH]{Boiling}Tribromobenzene\]
A)
benzoicacid done
clear
B)
salicylic acid done
clear
C)
phenol done
clear
D)
aniline done
clear
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question_answer62)
Aniline is reacted with bromine water and the resulting product is treated with an aqueous solution of sodium nitrite in presence of dilute\[HCl\]. The compound so formed is converted into tetrafluoroborate which is subsequently heated dry. The final product is
A)
p-Bromofluorobenzene done
clear
B)
p-Bromoaniline done
clear
C)
2, 4, 6-Tribromofluorobenzene done
clear
D)
1, 3, 5-Tribromobenzene done
clear
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question_answer63)
Arrange the following three compounds in order of decreasing acidity
A)
B>A>C done
clear
B)
B>C>A done
clear
C)
C>B>A done
clear
D)
C>A>B done
clear
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question_answer64)
In the reaction
The products of obtained are
A)
B)
C)
D)
None of these done
clear
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question_answer65)
In the acidic reduction of nitrobenzene, which of the following is the intermediate?
A)
\[{{C}_{6}}{{H}_{5}}-N=O\] done
clear
B)
\[{{C}_{6}}{{H}_{5}}NH-NH{{C}_{6}}{{H}_{5}}\] done
clear
C)
\[{{C}_{6}}{{H}_{5}}-N=N-{{C}_{6}}{{H}_{5}}\] done
clear
D)
\[{{C}_{6}}{{H}_{5}}-N=\overset{O}{\mathop{\overset{\uparrow }{\mathop{N}}\,}}\,-{{C}_{6}}{{H}_{5}}\] done
clear
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question_answer66)
'Z' in the following sequence of reactions is
\[{{C}_{6}}{{H}_{5}}\xrightarrow[\Delta ]{HN{{O}_{3}}/{{H}_{7}}S{{O}_{4}}}\text{W }\xrightarrow{Zn/HCl}\] \[X\xrightarrow[HCl]{NaN{{O}_{2}}}Y~\xrightarrow{{{H}_{2}}O/{{H}_{3}}P{{O}_{2}}}Z\] |
A)
B)
C)
D)
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question_answer67)
An organic compound [A] on reduction gives compound [B]. [B] on treatment with \[CHC{{l}_{3}}\] and alcoholic \[KOH\] gives [C]. [C] on catalytic reduction gives N-methylaniline. The compound A is
A)
Methylamine done
clear
B)
Nitromethane done
clear
C)
Aniline done
clear
D)
Nitrobenzene done
clear
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question_answer68)
A)
B)
C)
D)
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question_answer69)
Pyrrole and pyridine both are basic and form salts with acids?
Which of the following statement is true regarding the aromatic character of the four species?
A)
All the four are aromatic done
clear
B)
I, III and IV are aromatic done
clear
C)
I, II and III are aromatic done
clear
D)
I and III are aromatic done
clear
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question_answer70)
Ethylene can be prepared in good yield by
A)
\[C{{H}_{3}}C{{H}_{2}}{{N}^{+}}{{(C{{H}_{3}})}_{3}}{{I}^{-}}\xrightarrow{heat}\] \[C{{H}_{2}}=C{{H}_{2}}+{{(C{{H}_{3}})}_{3}}N+HI\] done
clear
B)
\[C{{H}_{3}}C{{H}_{2}}{{N}^{+}}{{(C{{H}_{3}})}_{3}}O{{H}^{-}}\xrightarrow{heat}\] \[C{{H}_{2}}=C{{H}_{2}}+{{\left( C{{H}_{3}} \right)}_{3}}N+{{H}_{2}}O\] done
clear
C)
Both [a] and [b] done
clear
D)
\[C{{H}_{3}}C{{H}_{2}}N{{H}_{2}}\xrightarrow{heat}\] \[{{\operatorname{CH}}_{2}}=C{{H}_{2}}+N{{H}_{3}}\] done
clear
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question_answer71)
Which of the following leads to carbon-carbon double bond?
A)
\[1{}^\circ \] Amine + \[RCHO\to \] done
clear
B)
\[2{}^\circ \] Amine + \[{{R}_{2}}CO\to \] done
clear
C)
\[2{}^\circ \] Amine + \[RCHO\to \] done
clear
D)
Both [b] and [c] done
clear
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question_answer72)
In Hoftnann bromamide degradation, one of the important steps is the migration of
A)
an alkyl group without its electron pair to electron deficient N atom. done
clear
B)
an alkyl group with its electron pair to electron deficient O atom. done
clear
C)
an alkyl group with its electron pair to electron rich N atom. done
clear
D)
an alkyl group with its electron pair to electron deficient N atom. done
clear
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question_answer73)
\[{{(C{{H}_{3}})}_{3}}C-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-N{{H}_{2}}\xrightarrow[(ii)\,{{D}_{2}}O]{(i)\,O{{D}^{-}}/B{{r}_{2}}}Product\,P\] is
A)
\[{{\left( C{{H}_{3}} \right)}_{3}}CN{{H}_{2}}\] done
clear
B)
\[{{\left( C{{H}_{3}} \right)}_{3}}CNHD\] done
clear
C)
\[{{\left( C{{H}_{3}} \right)}_{3}}CN{{D}_{2}}\] done
clear
D)
no reaction done
clear
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question_answer74)
Identify product D in the following reaction sequence:
A)
B)
C)
D)
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question_answer75)
A)
\[I>II>III\] done
clear
B)
\[III>II>I\] done
clear
C)
\[I>II\approx III\] done
clear
D)
\[I=II\equiv III\] done
clear
View Solution play_arrow
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question_answer76)
Which of the following can undergo electrophilic substitution when treated with nitrous acid at \[0{}^\circ C\]?
A)
\[{{C}_{6}}{{H}_{5}}N{{H}_{2}}\] done
clear
B)
\[{{C}_{6}}{{H}_{5}}NHC{{H}_{2}}\] done
clear
C)
\[{{C}_{6}}{{H}_{5}}N{{(C{{H}_{3}})}_{2}}\] done
clear
D)
None done
clear
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question_answer77)
When aniline reacts with oil of bitter almonds \[({{C}_{6}}{{H}_{5}}CHO)\] condensation takes place and benzal derivative is formed. This is known as
A)
Million's base done
clear
B)
Schiff reagent done
clear
C)
Schiffs base done
clear
D)
Benedict's reagent done
clear
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question_answer78)
The correct stability order of the following resonance structures is
\[\underset{(I)}{\mathop{{{H}_{2}}C=\overset{+}{\mathop{N}}\,=\overline{N}}}\,\] |
\[\underset{(II)}{\mathop{{{H}_{2}}\overset{+}{\mathop{C}}\,-\overset{{}}{\mathop{N}}\,=\overline{N}}}\,\] |
\[\underset{(III)}{\mathop{{{H}_{2}}\overset{-}{\mathop{C}}\,-\overset{+}{\mathop{N}}\,\equiv N}}\,\]
|
\[\underset{(IV)}{\mathop{{{H}_{2}}\overset{-}{\mathop{C}}\,-\overset{+}{\mathop{N}}\,=\overset{+}{\mathop{N}}\,}}\,\] |
A)
(I) > (II) > (IV) > (III) done
clear
B)
(I) > (III) > (II) > (IV) done
clear
C)
(II) > (I) > (III) > (IV) done
clear
D)
(III) > (I) > (IV) > (II) done
clear
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question_answer79)
Introduction of a methyl group in ammonia markedly increases the basic strength of ammonia in aq. solution, introduction of the second methyl group increases only marginally the basic, strength of methyl amine in water. This is due to
A)
different type of hybridisation in the two amines, done
clear
B)
protonated dimethyl amine is more solvated than methyl amine. done
clear
C)
protonated dimethyl amine is more solvated than the protonated methyl amine. done
clear
D)
protonated dimethyl amine is less stable than the protonated methyl amine. done
clear
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question_answer80)
Which of the following amines can be resolved into two enantiomers?
A)
I, IV done
clear
B)
I, II done
clear
C)
I, III, IV done
clear
D)
III, IV done
clear
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