Aldehydes, Ketones and Carboxylic Acids Practice Questions

Class 12 · Chemistry · 2455 free MCQs with instant results and detailed explanations.

2455

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763

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1199

Medium

493

Hard

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Topics in Aldehydes, Ketones and Carboxylic Acids

Uses 860

Reactions 814

Preparation 781

Sample Questions from Aldehydes, Ketones and Carboxylic Acids

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Easy

Which method is commonly used for the preparation of aldehydes from alcohols?

A. Oxidation

B. Reduction

C. Hydration

D. Dehydration

Show Answer & Explanation

Correct Answer: A

Aldehydes are typically prepared by oxidizing primary alcohols.

Easy

What reagent is used to convert an alcohol into a ketone?

A. Potassium dichromate

B. Sodium borohydride

C. Sodium hydroxide

D. Hydrochloric acid

Show Answer & Explanation

Correct Answer: A

Potassium dichromate is an oxidizing agent that can convert secondary alcohols to ketones.

Easy

Which of the following is a method to prepare carboxylic acids?

A. Hydrolysis of nitriles

B. Dehydration of alcohol

C. Reduction of esters

D. Displacement reaction

Show Answer & Explanation

Correct Answer: A

Nitriles can be hydrolyzed to yield carboxylic acids.

Medium

Which of the following methods is NOT commonly used for the preparation of aldehydes?

A. Reduction of carboxylic acids

B. Hydrolysis of nitriles

C. Oxidation of primary alcohols

D. Hydration of alkenes

Show Answer & Explanation

Correct Answer: D

Hydration of alkenes typically yields alcohols, not aldehydes. The other methods can directly produce aldehydes.

Medium

Which reagent is commonly used to convert a primary alcohol into an aldehyde?

A. CrO3

B. H2SO4

C. KMnO4

D. PCC

Show Answer & Explanation

Correct Answer: D

PCC (Pyridinium Chlorochromate) selectively oxidizes primary alcohols to aldehydes without further oxidation to acids.

Medium

Which of the following compounds can be directly prepared by the hydrolysis of a nitrile?

A. Aldehyde

B. Ketone

C. Carboxylic acid

D. Alcohol

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Correct Answer: C

Hydrolysis of nitriles yields carboxylic acids, as the nitrile undergoes hydrolysis to form the acid group.

Medium

Which of the following reactions is used to prepare ketones from alcohols?

A. Oxidation of secondary alcohols

B. Reduction of aldehydes

C. Hydration of alkynes

D. Hydrolysis of esters

Show Answer & Explanation

Correct Answer: A

Only the oxidation of secondary alcohols leads to the formation of ketones, making it the correct choice.

Hard

Which of the following reactions can be used to prepare an aldehyde from a primary alcohol?

A. Oxidation using KMnO4

B. Hydrogenation

C. Oxidation using PCC

D. Esterification

Show Answer & Explanation

Correct Answer: C

PCC (Pyridinium chlorochromate) selectively oxidizes primary alcohols to aldehydes without further oxidation to carboxylic acids.

Hard

Which reagent is used in the preparation of ketones from secondary alcohols?

A. KMnO4

B. PCC

C. H2SO4

D. LiAlH4

Show Answer & Explanation

Correct Answer: B

PCC is effective in oxidizing secondary alcohols to ketones while minimizing side reactions.

Q10

Hard

Which of the following methods can be used to synthesize a carboxylic acid from a nitrile?

A. Hydrolysis with water

B. Hydrogenation

C. Reduction with LiAlH4

D. Oxidation with KMnO4

Show Answer & Explanation

Correct Answer: A

Hydrolysis of nitriles with water in the presence of acid leads to the formation of carboxylic acids.

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Aldehydes, Ketones and Carboxylic Acids — Class 12 Chemistry Practice Questions Online

This page contains 2455 practice MCQs for the chapter Aldehydes, Ketones and Carboxylic Acids in Class 12 Chemistry. The questions are organized by difficulty — 763 easy, 1199 medium, 493 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 3 topics, giving you comprehensive coverage of the entire chapter.