JEE Main > Aldehydes, Ketones and Carboxylic Acids

Explore popular questions from Aldehydes, Ketones and Carboxylic Acids for JEE Main. This collection covers Aldehydes, Ketones and Carboxylic Acids previous year JEE Main questions hand picked by popular teachers.


Q 1.    

Correct4

Incorrect-1

what is B?

A

{tex} \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COCl } {/tex}

B

{tex} \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CHO } {/tex}

{tex} \mathrm { CH } _ { 2 } = \mathrm { CHCOOH } {/tex}

D

{tex} \mathrm { ClCH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { COOH } {/tex}

Explanation

Q 2.    

Correct4

Incorrect-1

On vigorous oxidation by permanganate solution.
{tex} \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { C } = \mathrm { CH } - \mathrm { CH } _ { 2 } - CHO {/tex} gives

A

C

D

Explanation

Q 3.    

Correct4

Incorrect-1

Picric acid is:

A

B

D

Explanation

Q 4.    

Correct4

Incorrect-1

When {tex} \mathrm { CH } _ { 2 } = \mathrm { CH } - \mathrm { COOH } {/tex} is reduced with {tex} LiAlH_4{/tex}, the compound obtained will be

{tex} \mathrm { CH } _ { 2 } = \mathrm { CH } - \mathrm { CH } _ { 2 } \mathrm { OH } {/tex}

B

{tex} \mathrm { CH } _ { 3 } - \mathrm { CH } _ { 2 } - \mathrm { CH } _ { 2 } \mathrm { OH } {/tex}

C

{tex} \mathrm { CH } _ { 3 } - \mathrm { CH } _ { 2 } - \mathrm { CHO } {/tex}

D

{tex} \mathrm { CH } _ { 3 } - \mathrm { CH } _ { 2 } - \mathrm { COOH } {/tex}

Explanation



Q 5.    

Correct4

Incorrect-1

On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is

A

{tex} \mathrm { CH } _ { 3 } \mathrm { COCl } + \mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { OH } + \mathrm { NaOH } {/tex}

B

{tex} \mathrm { CH } _ { 3 } \mathrm { COONa } + \mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { OH } {/tex}

{tex} \mathrm { CH } _ { 3 } \mathrm { COOC } _ { 2 } \mathrm { H } _ { 5 } + \mathrm { NaCl } {/tex}

D

{tex} \mathrm { CH } _ { 3 } \mathrm { Cl } + \mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { COONa } {/tex}

Explanation

Q 6.    

Correct4

Incorrect-1

Acetyl bromide reacts with excess of {tex} \mathrm { CH } _ { 3 } \mathrm { MgI } {/tex} followed by treatment with a saturated solution of {tex} \mathrm { NH } _ { 4 } \mathrm { Cl } {/tex} gives {tex}{/tex}

2 -methyl-2propanol

B

acetamide

C

acetone

D

acetyl iodide

Explanation

Q 7.    

Correct4

Incorrect-1

Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon?

A

Acetamide

B

Acetic acid

C

Ethyl acetate

Butan - 2 - one

Explanation



Q 8.    

Correct4

Incorrect-1

Which one of the following undergoes reaction with {tex}50 \% {/tex} sodium hyroxide solution to give the corresponding alcohol and acid?

A

Butanal

Benzaldehyde

C

Phenol

D

Benzoic acid

Explanation



Q 9.    

Correct4

Incorrect-1

Among the following acids which has the lowest {tex} pK_a{/tex} value?

A

{tex} \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH } {/tex}

B

{tex} \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CH } - \mathrm { COOH } {/tex}

{tex} \mathrm { HCOOH } {/tex}

D

{tex} \mathrm { CH } _ { 3 } \mathrm { COOH } {/tex}

Explanation

Q 10.    

Correct4

Incorrect-1

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

B

an imine

an anemine

D

a Schiff's base

Explanation

Q 11.    

Correct4

Incorrect-1

The increasing order of the rate of HCN addition to compound {tex} A - D {/tex} is
{tex} \begin{array} { l l } { \text { (A) HCHO } } & { \text { (B) } \mathrm { CH } _ { 3 } \mathrm { COCH } _ { 3 } } \\ { \text { (C) } \mathrm { PhCOCH } _ { 3 } } & { \text { (D) PhCOPh } } \end{array} {/tex}

{tex} D < C < B < A {/tex}

B

{tex} \mathrm { C } < \mathrm { D } < \mathrm { B } < \mathrm { A } {/tex}

C

{tex} A < B < C < D {/tex}

D

{tex} D < B < C < A {/tex}

Explanation

Q 12.    

Correct4

Incorrect-1

The correct order of increasing acid strenght of the compounds

is

{tex} \mathrm { D } < \mathrm { A } < \mathrm { B } < \mathrm { C } {/tex}

B

{tex} A < D < B < C {/tex}

C

{tex} \mathrm { B } < \mathrm { D } < \mathrm { A } < \mathrm { C } {/tex}

D

{tex} \mathrm { D } < \mathrm { A } < \mathrm { C } < \mathrm { B } {/tex}

Explanation


Q 13.    

Correct4

Incorrect-1

A liquid was mixed with ethanol and a drop of concentrated {tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex} was added. A compound with a fruity smell was formed. The liquid was:

A

{tex} \mathrm { HCHO } {/tex}

B

{tex} \mathrm { CH } _ { 3 } \mathrm { COCH } _ { 3 } {/tex}

{tex} \mathrm { CH } _ { 3 } \mathrm { COOH } {/tex}

D

{tex} \mathrm { CH } _ { 3 } \mathrm { OH } {/tex}

Explanation



Q 14.    

Correct4

Incorrect-1

Which of the following on heating with aqueous {tex} \mathrm { KOH } {/tex} , produces acetaldehyde?

A

{tex} \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { Cl } {/tex}

B

{tex} \mathrm { CH } _ { 2 } \mathrm { ClCH } _ { 2 } \mathrm { Cl } {/tex}

{tex} \mathrm { CH } _ { 3 } \mathrm { CHCl } _ { 2 } {/tex}

D

{tex} \mathrm { CH } _ { 3 } \mathrm { COCl } {/tex}

Explanation

Q 15.    

Correct4

Incorrect-1

In Cannizzaro reaction given below

the slowest step is:

the transfer of hydride to the carbonyl group

B

the abstraction of proton from the carboxylic group

C

the deprotonation of Ph {tex} \mathrm { CH } _ { 2 } \mathrm { OH } {/tex}

D

the attack of: {tex} \overset{\ominus}{\mathrm {OH}} {/tex} at the carboxyl group

Explanation



Q 16.    

Correct4

Incorrect-1

Which of the following reagents may be used to distinguish between phenol and benzoic acid?

A

Aqueous NaOH

B

Tollen's reagent

C

Molisch reagent

Neutral {tex} FeCl_{3}{/tex}

Explanation

Q 17.    

Correct4

Incorrect-1

Trichloroacetaldehyde was subjected to Cannizzaro's's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is:

{tex} 2,2,2 - {/tex} Trichloroethanol

B

Trichloromethanol

C

{tex} 2,2,2 - {/tex} Trichloropropanol

D

Chloroform

Explanation


Q 18.    

Correct4

Incorrect-1

The strongest acid amongst the following compounds is:

A

{tex} \mathrm { CH } _ { 3 } \mathrm { COOH } {/tex}

B

{tex} \mathrm { HCOOH } {/tex}

{tex} \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } ( \mathrm { Cl } ) \mathrm { CO } _ { 2 } \mathrm { H } {/tex}

D

{tex} \mathrm { ClCH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { COOH } {/tex}

Explanation

Q 19.    

Correct4

Incorrect-1

Sodium ethoxide has reacted with ethanoyl chloride. The compound that is produced in the above reaction is:

A

Diethyl ether

B

2 -Butanone

C

Ethyl chloride

Ethyl ethanoate

Explanation

Q 20.    

Correct4

Incorrect-1

Silver Mirror test is given by which one of the following compounds?

Acetaldehyde

B

Acetone

C

Benzaldehyde

D

Benzophenone

Explanation

Q 21.    

Correct4

Incorrect-1

Iodoform can be prepared from all except:

A

Ethyl methyl ketone

B

Isopropyl alcohol

C

3-Methyl 2 -butanone

Isobutyl alcohol

Explanation





Q 22.    

Correct4

Incorrect-1

In the given transformation, which of the following is the most appropriate reagent?

{tex} \mathrm { NH } _ { 2 } \mathrm { NH } _ { 2 } , \mathrm { OH } {/tex}

B

{tex} \mathrm { Zn } - \mathrm { Hg } / \mathrm { HCl } {/tex}

C

{tex} \mathrm { Na } , \mathrm { LiqNH } _ { 3 } {/tex}

D

{tex} \mathrm { NaBH } _ { 4 } {/tex}

Explanation



Q 23.    

Correct4

Incorrect-1

The most suitable reagent for the conversion of
{tex} \mathrm { R } - \mathrm { CH } _ { 2 } - \mathrm { OH } \rightarrow \mathrm { R } - \mathrm { CHO } {/tex} is:

A

{tex} \mathrm { KMnO } _ { 4 } {/tex}

B

{tex} \mathrm { K } _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex}

C

{tex} \mathrm { CrO } _ { 3 } {/tex}

{tex} \mathrm {PCC} {/tex} (Pyridinium Chlorochromate)

Explanation



Q 24.    

Correct4

Incorrect-1

In the reaction,

the product C is:

A

Acetaldehyde

B

Acetylene

Ethylene

D

Acetyl chloride

Explanation



Q 25.    

Correct4

Incorrect-1

In the following sequence of reactions:

the product is:

A

{tex} \mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { CH } _ { 2 } \mathrm { OH } {/tex}

{tex} \mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { CHO } {/tex}

C

{tex} \mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { COOH } {/tex}

D

{tex} \mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { CH } _ { 3 } {/tex}

Explanation