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

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Aldehydes, Ketones and Carboxylic Acids

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Q 1. Consider the reactions,

Identify {tex}A,X,Y{/tex} and {tex}Z{/tex}.

A

{tex} A{/tex} -Methoxymethane, {tex} X {/tex} -Ethanol, {tex} Y {/tex} -Ethanoic acid, {tex} \mathrm { Z } {/tex} -Semicarbazide.

{tex} A{/tex} -Ethanal, {tex} X {/tex} -Ethanol, {tex} Y - \mathrm { But } - 2 {/tex} -enal, {tex} Z{/tex} -Semicarbazone.

C

{tex} A{/tex} -Ethanol, {tex} X {/tex} -Acetaldehyde, {tex} Y {/tex} -Butanone, {tex} Z{/tex} -Hydrazone.

D

{tex} A{/tex} -Methoxymethane, {tex} X {/tex} -Ethanoic acid, {tex} Y {/tex} -Acetate ion, {tex} Z{/tex} -Hydrazine.

Explanation


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Q 2. Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

B

C

D

Explanation

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Q 3. The correct structure of the product 'A' formed in the reaction
is

A

C

D

Explanation


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Q 4. The correct order of strengths of the carboxylic acids.

A

{tex} I > II > I I {/tex}

{tex} II > III > I {/tex}

C

{tex} III > II > I{/tex}

D

{tex} II > I > I I I {/tex}

Explanation


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Q 5. The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha- carbon, is

A

a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation

a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism

C

a carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol

D

a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.

Explanation

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Q 6. Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is

hydrazine in presence of feebly acidic solution

B

hydrocyanic acid

C

sodium hydrogen sulphite

D

a Grignard reagent

Explanation


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Q 7. An organic compound 'X' having molecular formula {tex}C_{5}H_{10}O{/tex} yields phenylhydrazone and gives negative response to the iodoform test and Tollens' test. It produces n-pentane on reduction. 'X' could be

3-pentanone

B

n-amyl alcohol

C

pentanal

D

2-pentanone.

Explanation



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Q 8. The order of stability of the following tautomeric compounds is

A

{tex}\mathrm {II} > \mathrm {I} >\mathrm {I I I }{/tex}

B

{tex}\mathrm{ II} >\mathrm{ I I I} >\mathrm{ I }{/tex}

C

{tex} \mathrm { I } > \mathrm { II } > \mathrm { III } {/tex}

{tex} \mathrm { III } > \mathrm { II } > \mathrm { I } {/tex}

Explanation

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Q 9. Which of the following compounds will give a yellow precipitate with iodine and alkali?

Acetophenone

B

Methyl acetate

C

Acetamide

D

None of these

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Q 10. The order of reactivity of phenyl magnesium bromide (PhMgBr) with the following compounds:

A

{tex} \mathrm { II } > \mathrm { III } > \mathrm { I } {/tex}

B

{tex} \mathrm { II } > \mathrm { I } > \mathrm { III } {/tex}

C

{tex} \mathrm { I } > \mathrm { III } > \mathrm { II } {/tex}

{tex} \mathrm { I } > \mathrm { II } > \mathrm { III } {/tex}

Explanation


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Q 11. Match the compounds given in List-I with List-II and select the suitable option using the code given below.

A

{tex} ( \mathrm { A } ) - ( \mathrm { iv } ) , ( \mathrm { B } ) - ( \mathrm { i } ) , ( \mathrm { C } ) - ( \mathrm { iii } ) , ( \mathrm { D } ) - ( \mathrm { ii } ) {/tex}

B

{tex} ( \mathrm { A } ) - ( \mathrm { iv } ) , ( \mathrm { B } ) - ( \mathrm { ii } ) , ( \mathrm { C } ) - ( \mathrm { iii } ) , ( \mathrm { D } ) - \mathrm { i } {/tex}

C

{tex} ( \mathrm { A } ) - ( \mathrm { ii } ) , ( \mathrm { B } ) - ( \mathrm { iii } ) , ( \mathrm { C } ) - ( \mathrm { iv } ) , ( \mathrm { D } ) - \mathrm { i } {/tex}

{tex} ( \mathrm { A } ) - ( \mathrm { ii } ) , ( \mathrm { B } ) - ( \mathrm { i } ) , ( \mathrm { C } ) - ( \mathrm { i } \mathrm { v } ) , ( \mathrm { D } ) - ( \mathrm { iii } ) {/tex}

Explanation

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Q 12. Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is

A

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

B

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

C

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

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

Explanation


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Q 13. Which one of the following compounds will be most readily dehydrated?

A

B

D

Explanation


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Q 14. Propionic acid with {tex} \mathrm { Br } _ { 2 } / \mathrm { P } {/tex} yields a dibromo product. Its structure would be

A

B

{tex} \mathrm { CH } _ { 2 } ( \mathrm { Br } ) - \mathrm { CH } _ { 2 } - \mathrm { COBr } {/tex}

D

{tex} \mathrm { CH } _ { 2 } ( \mathrm { Br } ) - \mathrm { CH } ( \mathrm { Br } ) - \mathrm { COOH } {/tex}

Explanation


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Q 15. A strong base can abstract an {tex} \alpha {/tex}-hydrogen from

ketone

B

alkane

C

alkene

D

amine.

Explanation


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Q 16. The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of

A

Acid anhydride {tex} > {/tex} Amide {tex} > {/tex} Ester {tex} > {/tex} Acyl chloride

B

Acyl chloride {tex} > {/tex} Ester {tex} > {/tex} Acid anhydride {tex} > {/tex} Amide

Acyl chloride {tex} > {/tex} Acid anhydride {tex} > {/tex} Ester {tex} > {/tex} Amide

D

Ester {tex} > {/tex} Acyl chloride {tex} > {/tex} Amide {tex} > {/tex} Acid anhydride.

Explanation


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Q 17. Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called

A

Cope reduction

B

Dow reduction

C

Wolf-Kishner reduction

Clemmensen reduction.

Explanation