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JEE Main

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 experienced teachers.

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Aldehydes, Ketones and Carboxylic Acids

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Q 1. When benzyl chloride is treated with ethanolic {tex} \mathrm { KCN } , {/tex} followed by acidification, the major product formed is:

A

benzoic acid

B

benzyl alcohol

C

benzyl cyanide

phenyl acetic acid

Explanation

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Q 2. {tex} \mathrm { CH } _ { 3 } \mathrm { CO } _ { 2 } \mathrm { C } _ { 2 } \mathrm { H } _ { 5 } {/tex} on reaction with sodium ethoxide in ethanol gives {tex} \mathrm { A } , {/tex} which on heating in the presence of acid gives {tex} \mathrm { B } {/tex}, then compound {tex} \mathrm { B } {/tex} is-

A

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

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

C

D

Explanation

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Q 3. 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



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Q 4. Iodoform can be prepared from all except:

A

Ethyl methyl ketone

B

Isopropyl alcohol

C

3-Methyl 2 -butanone

Isobutyl alcohol

Explanation





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Q 5. 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

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Q 6. 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

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Q 7. Silver Mirror test is given by which one of the following compounds?

Acetaldehyde

B

Acetone

C

Benzaldehyde

D

Benzophenone

Explanation

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Q 8. 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

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Q 9. 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



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Q 10. In the reaction,

the product C is:

A

Acetaldehyde

B

Acetylene

Ethylene

D

Acetyl chloride

Explanation



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Q 11.
What is {tex} B ? {/tex}

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

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Q 12. In the anion {tex} \mathrm { HCOO } ^ { - } {/tex} the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?

A

Electronic orbitals of carbon atom are hybridised.

B

The {tex}\mathrm {C} = \mathrm{O} {/tex} bond is weaker than the {tex}\mathrm C - \mathrm O {/tex} bond.

The anion {tex} \mathrm { HCOO } ^ { - } {/tex} has two resonating structures.

D

The anion is obtained by removal of a proton from the acid molecule.

Explanation


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Q 13. On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is

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

B

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

C

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

D

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

Explanation


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Q 14. The general formula {tex} \mathrm { C } _ { n } \mathrm { H } _ { 2 n } \mathrm { O } _ { 2 } {/tex} could be for open chain

A

diketones

carboxylic acids

C

diols

D

dialdehydes.

Explanation


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Q 15. Among the following the one that gives positive iodoform test upon reaction with {tex} \mathrm { I } _ { 2 } {/tex} and {tex} \mathrm { NaOH } {/tex} is

A

{tex} \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } ( \mathrm { OH } ) \mathrm { CH } _ { 2 } \mathrm { CH } _ { 3 } {/tex}

B

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

C

{tex} \mathrm {PhCHOHCH_3} {/tex}

Explanation


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Q 16. Picric acid is:

A

B

D

Explanation

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Q 17. 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

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Q 18. 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

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Q 19. 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



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Q 20. When {tex} \mathrm { CH } _ { 2 } = \mathrm { CH } - \mathrm { COOH } {/tex} is reduced with {tex}\mathrm{LiAlH}_4{/tex}, the compound obtained will be

A

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

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

C

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

D

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

Explanation


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Q 21. 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

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Q 22. 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

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Q 23. 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



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Q 24. Which of the following compounds has wrong {tex}\mathrm{IUPAC}{/tex} name?

A

{tex} \begin{aligned} \mathrm { CH } _ { 3 } - \mathrm { CH } _ { 2 } - \mathrm { CH } _ { 2 } - \mathrm { COO } & - \mathrm { CH } _ { 2 } \mathrm { CH } _ { 3 } \\ & \rightarrow \text { ethyl butanoate } \end{aligned} {/tex}

B

D

Explanation

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Q 25. 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