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JEE • CHEMISTRY • ALDEHYDES & KETONES & CARBOXYLIC ACIDS

Aldehydes & ketones & carboxylic acids practice · Easy

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These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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1 Easy

1 of 56

Understanding +4 | -1

Carboxylic acids dimerise due to

View answer and explanation

Correct option: C

Intermolecular hydrogen bonding

The correct answer is C (Intermolecular hydrogen bonding) because carboxylic acids form dimers through intermolecular hydrogen bonds between the carbonyl oxygen and the hydroxyl hydrogen of two molecules.

2 Easy

2 of 56

Analyzing +4 | -1

The most acidic among the following is:

View answer and explanation

Correct option: C

\mathrm{C}{\mathrm{H}_3}\mathrm{COOH}

Option C (

\mathrm{C}{\mathrm{H}_3}\mathrm{COOH}

) is correct because carboxylic acids are generally more acidic than alcohols and phenols due to resonance stabilization of the carboxylate anion.

3 Easy

3 of 56

Understanding +4 | -1

Acetic acid will be obtained on oxidation of

View answer and explanation

Correct option: A

Ethanol

Option A (Ethanol) is correct because the oxidation of ethanol yields acetic acid.

4 Easy

4 of 56

Analyzing +4 | -1

Which of the following is a better reducing agent for the following reduction?

R\mathrm{COOH} \to R\mathrm{C}{\mathrm{H}_2}\mathrm{OH}

View answer and explanation

Correct option: D

{\mathrm{B}_2}{\mathrm{H}_6}/{\mathrm{H}_3}{\mathrm{O}^ + }

Option D (B2H6/H3O+) is correct because diborane is a selective reducing agent that reduces carboxylic acids to primary alcohols without affecting other functional groups.

5 Easy

5 of 56

Remembering +4 | -1

General formula of carbonyl compound is:

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Correct option: A

{\mathrm{C}_n}{\mathrm{H}_{2n}}\mathrm{O}

Option A (

{\mathrm{C}_n}{\mathrm{H}_{2n}}\mathrm{O}

) is correct because carbonyl compounds (aldehydes and ketones) have the general formula

{\mathrm{C}_n}{\mathrm{H}_{2n}}\mathrm{O}

6 Easy

6 of 56

Remembering +4 | -1

Action of acetylene on dilute

{H}_2 {SO}_4

gives

View answer and explanation

Correct option: B

Acetaldehyde

Option B (Acetaldehyde) is correct because acetylene reacts with dilute sulfuric acid in the presence of mercuric sulfate to form acetaldehyde.

7 Easy

7 of 56

Remembering +4 | -1

The term hypnone is used for:

View answer and explanation

Correct option: B

Acetophenone

Option B (Acetophenone) is correct because Acetophenone is known as hypnone due to its hypnotic properties.

8 Easy

8 of 56

Understanding +4 | -1

Which of the following will not undergo aldol condensation?

View answer and explanation

Correct option: C

Benzaldehyde

Option C is correct because benzaldehyde lacks an alpha-hydrogen, which is required for aldol condensation to occur.

9 Easy

9 of 56

Understanding +4 | -1

Hydrolysis of acetamide produces which of the following.

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Correct option: A

Acetic acid

The correct answer is A (Acetic acid) because hydrolysis of acetamide in the presence of a base produces acetic acid and ammonia.

10 Easy

10 of 56

Understanding +4 | -1

Acetic acid on heating with urea gives:

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Correct option: A

Acetamide, carbon dioxide and ammonia

Option A (Acetamide, carbon dioxide and ammonia) is correct because acetic acid reacts with urea upon heating to produce acetamide, carbon dioxide, and ammonia.

11 Easy

11 of 56

Remembering +4 | -1

Composition of Fehling solution

A

and Fehling solution

B

View answer and explanation

Correct option: A

an aqueous copper sulphate and alkaline sodium potassium tartarate (Rochelle salt) respectively

Option A (an aqueous copper sulphate and alkaline sodium potassium tartarate (Rochelle salt) respectively) is correct because Fehling's solution A is aqueous copper sulfate, and Fehling's solution B is alkaline sodium potassium tartrate (Rochelle salt).

12 Easy

12 of 56

Remembering +4 | -1

Which of the following contain an aldehyde?

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because vanilla beans, meadowsweet, and cinnamon all contain aldehydes, specifically vanillin, salicylaldehyde, and cinnamaldehyde, respectively.

13 Easy

13 of 56

Remembering +4 | -1

Chloral belongs to the class of:

View answer and explanation

Correct option: B

Aldehydes

Option B (Aldehydes) is correct because Chloral has the formula

\mathrm{CC}{\mathrm{l}_3}\mathrm{CHO}

, which contains the -CHO functional group characteristic of aldehydes.

14 Easy

14 of 56

Remembering +4 | -1

Formalin is:

View answer and explanation

Correct option: C

Formaldehyde + methanol + water

Option C (Formaldehyde + methanol + water) is correct because formalin is a solution of formaldehyde in water, typically stabilized with methanol to prevent polymerization.

15 Easy

15 of 56

Remembering +4 | -1

Diborane easily reduce the functional group such as

View answer and explanation

Correct option: A

acid

Option A is correct because diborane (

B_2H_6

) readily reduces carboxylic acids to primary alcohols.

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16 Easy

16 of 56

Understanding +4 | -1

Acetaldehyde cannot show

View answer and explanation

Correct option: B

Lucas test

Option B is correct because the Lucas test is specific to alcohols and is used to differentiate between primary, secondary, and tertiary alcohols, not aldehydes.

17 Easy

17 of 56

Analyzing +4 | -1

Oxidation of which compound is not possible?

View answer and explanation

Correct option: A

\mathrm{C}{\mathrm{H}_3} - \mathrm{COOH}

Option A (

\mathrm{C}{\mathrm{H}_3} - \mathrm{COOH}

) is correct because carboxylic acids are already in a high oxidation state and are generally resistant to further oxidation.

18 Easy

18 of 56

Analyzing +4 | -1

An organic acid when heated strongly with

{{\mathrm{P}_2}{\mathrm{O}_5}}

, gave rise to a colourless gas which burns with a pale blue flame. The acid is:

View answer and explanation

Correct option: B

Formic acid

Option B (Formic acid) is correct because formic acid, when heated with

{{\mathrm{P}_2}{\mathrm{O}_5}}

, dehydrates to produce carbon monoxide, which burns with a pale blue flame.

19 Easy

19 of 56

Remembering +4 | -1

Pyroligneous acid contains:

View answer and explanation

Correct option: C

10% acetic acid

Option C (10% acetic acid) is correct because pyroligneous acid, obtained from the destructive distillation of wood, contains approximately 10% acetic acid.

20 Easy

20 of 56

Remembering +4 | -1

Imine derivatives of aldehyde and ketone is called as

View answer and explanation

Correct option: C

Schiff’s base

Option C (Schiff’s base) is correct because imine derivatives of aldehydes and ketones are known as Schiff's bases.

21 Easy

21 of 56

Remembering +4 | -1

Which of the following have pleasant smell?

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Correct option: D

Hexanal

Option D (Hexanal) is correct because as the size of the aldehyde molecule increases, the odor becomes less pungent and more fragrant.

22 Easy

22 of 56

Understanding +4 | -1

Arrange the following compounds in their acidic strength order.
I. Ethanoic acid
II. Propanoic acid
III. Butanoic acid

View answer and explanation

Correct option: A

>

>

III

Option A is correct because the acidic strength decreases as the alkyl chain length increases due to the +I inductive effect, so ethanoic acid is the strongest.

23 Easy

23 of 56

Analyzing +4 | -1

\mathrm{C}{\mathrm{H}_3}\mathrm{COOH}\;\mathrm{and}\;{\mathrm{C}_6}{\mathrm{H}_5}\mathrm{COOH}

can be distinguished by:

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because

\mathrm{C}{\mathrm{H}_3}\mathrm{COOH}

and

{\mathrm{C}_6}{\mathrm{H}_5}\mathrm{COOH}

differ in physical state, solubility, and flame characteristics.

24 Easy

24 of 56

Remembering +4 | -1

Lindlar’s catalyst is:

View answer and explanation

Correct option: B

\mathrm{pd - CaC}{\mathrm{O}_3} + \mathrm{BaS}{\mathrm{O}_4}

Option B (

\mathrm{pd - CaC}{\mathrm{O}_3} + \mathrm{BaS}{\mathrm{O}_4}

) is correct because Lindlar's catalyst is palladium supported on calcium carbonate, poisoned with barium sulfate or quinoline.

25 Easy

25 of 56

Understanding +4 | -1

What is the neutralization equivalent of benzoic acid?

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Correct option: A

122

Option A (122) is correct because benzoic acid is a monobasic acid, so its molecular weight equals its neutralization equivalent.

26 Easy

26 of 56

Remembering +4 | -1

Stinges of bees, red ant and wasps contain:

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Correct option: B

Formic acid

Option B (Formic acid) is correct because the stings of bees, red ants, and wasps contain formic acid.

27 Easy

27 of 56

Analyzing +4 | -1

Which of the following reagents reacts differently with

\mathrm{HCHO}, \mathrm{CH}_3 \mathrm{CHO}

and

\mathrm{CH}_3 \mathrm{COCH}_3?

View answer and explanation

Correct option: D

\mathrm{NH}_3

The correct answer is D (NH3) because HCHO forms hexamethylenetetramine, CH3CHO forms acetaldehyde ammonia trimer, and CH3COCH3 forms ketimine, showing different reaction patterns with NH3.

28 Easy

28 of 56

Understanding +4 | -1

Which method is not used in the preparation of ketone?

View answer and explanation

Correct option: C

Acid hydrolysis of alkyl cyanide

The correct answer is D (Reaction of acid chloride with Grignard reagents) because this reaction leads to a tertiary alcohol, not a ketone.

29 Easy

29 of 56

Understanding +4 | -1

Why the aromatic carboxylic acids do not undergo Friedel-Crafts reaction?

View answer and explanation

Correct option: B

Carboxyl group act as a deactivating and ortho-directing group

Option D is correct because the carboxyl group deactivates the benzene ring and the catalyst (AlCl3) coordinates with the carboxyl group, preventing it from acting as a Lewis acid.

30 Easy

30 of 56

Remembering +4 | -1

Liquid obtained by distillation of red ant is

View answer and explanation

Correct option: C

Formic acid

Option C (Formic acid) is correct because formic acid is obtained by the distillation of red ants.

Revision notes and key takeaways

Review ALDEHYDES & KETONES & CARBOXYLIC ACIDS in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 56 single-correct-answer MCQs on ALDEHYDES & KETONES & CARBOXYLIC ACIDS.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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Aldehydes & ketones & carboxylic acids practice · Easy

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