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question_answer1)
Directions : (1 - 5) |
Case I : Read the passage given below an answer the following questions from 1 to 5. |
Both alcohols and phenols are acidic in nature, but phenols are more acidic than alcohols. Acidic strength of alcohols mainly depends upon the inductive effect. Acidic strength of phenols depends upon a combination of both inductive effect and resonance effects of the substituent and its position on the benzene ring. Electron withdrawing groups increases the acidic strength of phenols whereas electron donating groups decreases the acidic strength of phenols. Phenol is a weaker acid than carboxylic acid. |
Phenols are highly acidic as compared to alcohols due to
A)
the higher molecular mass of phenols done
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B)
the stronger hydrogen bonds in phenols done
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C)
alkoxide ion is a strong conjugate base done
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D)
phenoxide ion is resonance stabilised. done
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question_answer2)
The correct order of acidic strength among the following is |
(I) \[{{H}_{2}}O\] |
(II) \[C{{H}_{3}}C{{H}_{2}}OH\] |
(III) |
(IV) |
A)
(III) > (IV) > (II) > (I) done
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B)
(IV) > (III) > (I) > (II) done
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C)
(IV) > (III) > (II) > (I) done
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D)
(I) > (II) > (IV) > (III) done
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question_answer3)
The correct decreasing order of \[p{{K}_{a}}\] value is |
|
A)
II>IV>I>III done
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B)
IV>II>III>I done
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C)
III>II>IV>I done
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D)
IV>I>II>III done
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question_answer4)
The compound that does not liberate \[C{{O}_{2}}\], on treatment with aqueous sodium bicarbonate solution is
A)
benzoic acid done
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B)
benzenesulphonic acid done
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C)
salicylic acid done
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D)
carbolic acid. done
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question_answer5)
Most acidic amongst the following is
A)
B)
C)
D)
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question_answer6)
Directions : (6 - 10) |
Case II : Read the passage given below and answer the following questions. |
Williamson's synthesis is used for the preparation of symmetrical as well as unsymmerical ether. It is \[{{S}_{N}}2\] reaction mechanism. In Williamson's synthesis, \[1{}^\circ \] alkyl halide are used for preparation of ethers because \[2{}^\circ \] and \[3{}^\circ \] alkyl halide give alkene. Ethers are cleaved by hydrogen halides to alcohol and alkyl halide where alkyl halide is corresponding to that alkyl which has less number of carbon atom (it is because of less steric hindrance). In polar media unsymmetrical ether like tertiary butyl ethyl ether gives ethyl alcohol and tertiary butyl halide as reaction proceeds via carbocation formation. |
In the following questions (Q. No. 6-10), a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage. |
Assertion : Rate of reaction of alkyl halide in Williamson's synthesis reaction is \[1{}^\circ RX\text{ }>\text{ }2{}^\circ RX\text{ }>\text{ }3{}^\circ RX\]. |
Reason : It is a type of bimolecular substitution reaction (\[{{S}_{N}}2\]). |
A)
Assertion and reason both are correct statements and reason is correct explanation for assertion. done
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B)
Assertion and reason both are correct statements but reason is not correct explanation for assertion. done
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C)
Assertion is correct statement but reason is wrong statement. done
clear
D)
Assertion is wrong statement but reason is correct statement. done
clear
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question_answer7)
Assertion: t-Butyl methyl ether is not prepared by the reaction of t-butyl bromide with sodium methoxide. |
Reason : Sodium methoxide is a weak nucleophile. |
A)
Assertion and reason both are correct statements and reason is correct explanation for assertion. done
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B)
Assertion and reason both are correct statements but reason is not correct explanation for assertion. done
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C)
Assertion is correct statement but reason is wrong statement. done
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D)
Assertion is wrong statement but reason is correct statement. done
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question_answer8)
Assertion : Williamson's synthesis method cannot be used for preparing diphenyl ether. |
Reason : Aryl halides do not undergo nucleophilic substitution easily. |
A)
Assertion and reason both are correct statements and reason is correct explanation for assertion. done
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B)
Assertion and reason both are correct statements but reason is not correct explanation for assertion. done
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C)
Assertion is correct statement but reason is wrong statement. done
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D)
Assertion is wrong statement but reason is correct statement. done
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question_answer9)
Assertion : When isopropyl bromide is treated with sodium isopropoxide, di-isopropyl ether is obtained as a major product. |
Reason : With secondary alkyl halides, both substitution and elimination occur. |
A)
Assertion and reason both are correct statements and reason is correct explanation for assertion. done
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B)
Assertion and reason both are correct statements but reason is not correct explanation for assertion. done
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C)
Assertion is correct statement but reason is wrong statement. done
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D)
Assertion is wrong statement but reason is correct statement. done
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question_answer10)
Assertion : Both symmetrical and unsymmetrical ethers can be prepared by Williamson's synthesis. |
Reason: Williamson's synthesis is an example of nucleophilic substitution reaction. |
A)
Assertion and reason both are correct statements and reason is correct explanation for assertion. done
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B)
Assertion and reason both are correct statements but reason is not correct explanation for assertion. done
clear
C)
Assertion is correct statement but reason is wrong statement. done
clear
D)
Assertion is wrong statement but reason is correct statement. done
clear
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question_answer11)
Directions : (11 - 15) |
Case III : Read the passage given below and answer the following questions from 11 to 15. |
Dehydration of alcohols can lead to the formation of either alkenes or ethers. This dehydration can be carried out either with protonic acids such as cone. \[{{H}_{2}}S{{O}_{4}}\], \[{{H}_{3}}P{{O}_{4}}\] or catalysts such as anhydrous \[ZnC{{l}_{2}}\]or\[A{{l}_{2}}{{O}_{3}}\]. When primary alcohols are heated with cone. \[{{H}_{2}}S{{O}_{4}}\] at 433-443 K, they undergo intramolecular dehydration to form alkenes. Secondary and tertiary alcohols undergo dehydration under milder conditions. |
The ease of dehydration of alcohols follows the order :\[3{}^\circ \text{ }>\text{ }2{}^\circ \text{ }>\text{ }1{}^\circ \]. |
The dehydration of alcohols always occurs in accordance with the Saytzeff's rule. Primary alcohols when heated with protic acid at 413 K, gives dialkyl ether. |
\[C{{H}_{3}}C{{H}_{2}}OH\xrightarrow[433-443\,K]{conc.\,{{H}_{2}}S{{O}_{4}}}C{{H}_{2}}=C{{H}_{2}}+{{H}_{2}}O\] |
\[2C{{H}_{3}}C{{H}_{2}}OH\xrightarrow[413\,K]{conc.\,{{H}_{2}}S{{O}_{4}}}\] |
\[C{{H}_{3}}C{{H}_{2}}-O-C{{H}_{2}}C{{H}_{3}}+{{H}_{2}}O\] |
Which one of the following alcohols undergoes acid-catalysed dehydration to alkenes most readily?
A)
\[{{\left( C{{H}_{3}} \right)}_{2}}CHC{{H}_{2}}OH\] done
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B)
\[{{\left( C{{H}_{3}} \right)}_{3}}COH\] done
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C)
\[C{{H}_{3}}CHOHC{{H}_{3}}\] done
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D)
\[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH\] done
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question_answer12)
Dehydration of alcohol is an example of which type of reaction?
A)
Substitution done
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B)
Elimination done
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C)
Addition done
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D)
Rearrangement done
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question_answer13)
The alcohol which does not give a stable compound on dehydration is
A)
ethyl alcohol done
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B)
methyl alcohol done
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C)
n-propyl alcohol done
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D)
n-butyl alcohol. done
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question_answer14)
products. |
The most stable product(s) is/are |
A)
B)
C)
both [a] and [b] done
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D)
none of these. done
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question_answer15)
The product of the reaction
X, is
A)
B)
C)
D)
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question_answer16)
Directions : (16 - 20) |
Case IV : Read the passage given below and answer the following questions from 16 to 20. |
A compound (X) containing C, H and O is unreactive towards sodium. It also does not react with Schiff's reagent. On refluxing with an excess of hydroiodicacid, (X) yields only one organic product (Y). On hydrolysis, (Y) yields a new compound (Z) which can be converted into (Y) by reaction with red phosphorus and iodine. The compound (Z) on oxidation with potassium permanganate gives a carboxylic acid. The equivalent weight of this acid is 60. |
The compound (X) is an
A)
acid done
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B)
aldehyde done
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C)
alcohol done
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D)
ether. done
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question_answer17)
The IUPAC name of the acid formed is
A)
methanoic acid done
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B)
ethanoic acid done
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C)
propanoic acid done
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D)
butanoic acid. done
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question_answer18)
Compound (Y) is
A)
ethyl iodide done
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B)
methyl iodide done
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C)
propyl lodide done
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D)
mixture of [a] and [b] done
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question_answer19)
Compound (Z) is
A)
methanol done
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B)
ethanol done
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C)
propanol done
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D)
butanol. done
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question_answer20)
Compound (X) on treatment with excess of \[C{{l}_{2}}\] in presence of light gives
A)
\[\alpha \]-chlorodiethyl ether done
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B)
\[\alpha \], \[\alpha \]'-dichlorodiethyl ether done
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C)
perchlorodiethyl ether done
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D)
none of these. done
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question_answer21)
Directions : (21 - 25) |
Case V : Read the passage given below and answer the following questions from 21 to 25. |
Reimer-Tiemannreactionintroducesanaldehyde group, on aromatic ring of phenol, ortho to the hydroxyl group. This is a general method for the synthesis of substituted salicylaldehydes as depicted below: |
|
Reimer-Tiemann reaction is an example of
A)
nucleophilic substitution reaction done
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B)
electrophilic substitution reaction done
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C)
nucleophilic addition reaction done
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D)
electrophilic addition reaction. done
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question_answer22)
Which of the following reagents is used in the given reaction?
A)
\[aq.NaOH+C{{H}_{3}}Cl\] done
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B)
\[aq.NaOH+C{{H}_{2}}C{{l}_{2}}\] done
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C)
\[aq.NaOH+CHC{{l}_{3}}\] done
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D)
\[aq.NaOH+CC{{l}_{4}}\] done
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question_answer23)
The electrophile in this reaction is
A)
\[:CHCl\] done
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B)
\[^{+}CHC{{l}_{2}}\] done
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C)
\[:CC{{l}_{2}}\] done
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D)
\[.CC{{l}_{3}}\] done
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question_answer24)
The structure of the intermediate [A] is
A)
B)
C)
D)
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question_answer25)
When phenol reacts with chloroform in presence of KOH, the product formed is
A)
salicylic acid done
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B)
salicylaldehyde done
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C)
both [a] and [b] done
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D)
none of these. done
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