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Home/JEE MAINS/chemistry/aldehydes ketones and carboxylic acids
Curated PYQ Collection

Top 50 Most Repeated ALDEHYDES KETONES AND CARBOXYLIC ACIDS PYQs | JEE MAINS

A curated collection of the most important questions from ALDEHYDES KETONES AND CARBOXYLIC ACIDS, fully solved with step-by-step concepts to prepare for JEE MAINS.

Question #1

Practice Question

A.Acetone
B.Formaldehyde
C.Acetic acid
D.Ethanol

Concept Applied

Tollens' test is for aldehydes; formaldehyde is an aldehyde and reduces Tollens’ reagent....

Read Full Step-by-Step Solution →

Question #2

Practice Question

A.$\varepsilon$‑caprolactone
B.cyclohexanol
C.cyclohexanone oxide
D.cyclohexanecarboxylic acid

Concept Applied

The Baeyer‑Villiger oxidation inserts an oxygen adjacent to the carbonyl carbon. For a cyclic ketone, this expands the ring by one atom, giving a lact...

Read Full Step-by-Step Solution →

Question #3

Practice Question

A.SOCl₂
B.PCl₃
C.PCl₅
D.All of the above

Concept Applied

SOCl₂, PCl₃, and PCl₅ all convert carboxylic acids to acid chlorides....

Read Full Step-by-Step Solution →

Question #4

Practice Question

A.Oxidizing agent
B.Dehydrating agent and catalyst
C.Nucleophile
D.Base catalyst

Concept Applied

Concentrated $H_2SO_4$ protonates the carbonyl oxygen, making the carbon more electrophilic, and also removes water to shift equilibrium toward ester ...

Read Full Step-by-Step Solution →

Question #5

Practice Question

A.$\text{CH}_3\text{CH}_2\text{CHO}$
B.$\text{CH}_3\text{CH(OH)CH}_2\text{CHO}$
C.$\text{CH}_3\text{CH}=\text{CHCHO}$
D.$\text{CH}_3\text{COCH}_3$

Concept Applied

Aldol condensation of acetaldehyde involves nucleophilic addition of enolate to another acetaldehyde molecule, forming 3-hydroxybutanal ($\text{CH}_3\...

Read Full Step-by-Step Solution →

Question #6

Practice Question

A.Ethanol
B.Benzaldehyde
C.Propan-2-one
D.Acetone

Concept Applied

Aromatic aldehydes such as benzaldehyde readily reduce Tollens' reagent, forming a silver mirror. However, due to resonance stabilization, they often ...

Read Full Step-by-Step Solution →

Question #7

Practice Question

A.Protonation of the carbonyl oxygen
B.Nucleophilic attack by ethanol on the protonated carbonyl carbon
C.Loss of water from the tetrahedral intermediate
D.Deprotonation of the oxonium ion to form ester

Concept Applied

Fischer esterification is acid-catalyzed. After protonation of carbonyl, the nucleophilic attack by alcohol on the electrophilic carbon is slow and re...

Read Full Step-by-Step Solution →

Question #8

Practice Question

A.Proton transfer
B.Nucleophilic attack
C.Loss of water
D.Carbocation formation

Concept Applied

Protonation of carbonyl makes it electrophilic; nucleophilic attack is slow....

Read Full Step-by-Step Solution →

Question #9

Practice Question

A.Acetaldehyde
B.Propionaldehyde
C.Benzaldehyde
D.Butanal

Concept Applied

Benzaldehyde lacks $\alpha$-hydrogen atoms....

Read Full Step-by-Step Solution →

Question #10

Practice Question

A.Acetal
B.Cyanohydrin
C.Aldol
D.Hemiacetal

Concept Applied

HCN adds to carbonyl forming cyanohydrin via nucleophilic addition....

Read Full Step-by-Step Solution →

Question #11

Practice Question

A.A fundamental principle of Chemistry.
B.A complex derivation in JEEMains syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Aldehydes, Ketones a...

Read Full Step-by-Step Solution →

Question #12

Practice Question

A.Acetone
B.Formaldehyde
C.Acetic acid
D.Ethanol

Concept Applied

Tollens' test is for aldehydes; formaldehyde is an aldehyde and reduces Tollens’ reagent....

Read Full Step-by-Step Solution →

Question #13

Practice Question

A.$\varepsilon$‑caprolactone
B.cyclohexanol
C.cyclohexanone oxide
D.cyclohexanecarboxylic acid

Concept Applied

The Baeyer‑Villiger oxidation inserts an oxygen adjacent to the carbonyl carbon. For a cyclic ketone, this expands the ring by one atom, giving a lact...

Read Full Step-by-Step Solution →

Question #14

Practice Question

A.SOCl₂
B.PCl₃
C.PCl₅
D.All of the above

Concept Applied

SOCl₂, PCl₃, and PCl₅ all convert carboxylic acids to acid chlorides....

Read Full Step-by-Step Solution →

Question #15

Practice Question

A.Oxidizing agent
B.Dehydrating agent and catalyst
C.Nucleophile
D.Base catalyst

Concept Applied

Concentrated $H_2SO_4$ protonates the carbonyl oxygen, making the carbon more electrophilic, and also removes water to shift equilibrium toward ester ...

Read Full Step-by-Step Solution →

Question #16

Practice Question

A.$\text{CH}_3\text{CH}_2\text{CHO}$
B.$\text{CH}_3\text{CH(OH)CH}_2\text{CHO}$
C.$\text{CH}_3\text{CH}=\text{CHCHO}$
D.$\text{CH}_3\text{COCH}_3$

Concept Applied

Aldol condensation of acetaldehyde involves nucleophilic addition of enolate to another acetaldehyde molecule, forming 3-hydroxybutanal ($\text{CH}_3\...

Read Full Step-by-Step Solution →

Question #17

Practice Question

A.Ethanol
B.Benzaldehyde
C.Propan-2-one
D.Acetone

Concept Applied

Aromatic aldehydes such as benzaldehyde readily reduce Tollens' reagent, forming a silver mirror. However, due to resonance stabilization, they often ...

Read Full Step-by-Step Solution →

Question #18

Practice Question

A.Protonation of the carbonyl oxygen
B.Nucleophilic attack by ethanol on the protonated carbonyl carbon
C.Loss of water from the tetrahedral intermediate
D.Deprotonation of the oxonium ion to form ester

Concept Applied

Fischer esterification is acid-catalyzed. After protonation of carbonyl, the nucleophilic attack by alcohol on the electrophilic carbon is slow and re...

Read Full Step-by-Step Solution →

Question #19

Practice Question

A.Proton transfer
B.Nucleophilic attack
C.Loss of water
D.Carbocation formation

Concept Applied

Protonation of carbonyl makes it electrophilic; nucleophilic attack is slow....

Read Full Step-by-Step Solution →

Question #20

Practice Question

A.Acetaldehyde
B.Propionaldehyde
C.Benzaldehyde
D.Butanal

Concept Applied

Benzaldehyde lacks $\alpha$-hydrogen atoms....

Read Full Step-by-Step Solution →

Question #21

Practice Question

A.Acetal
B.Cyanohydrin
C.Aldol
D.Hemiacetal

Concept Applied

HCN adds to carbonyl forming cyanohydrin via nucleophilic addition....

Read Full Step-by-Step Solution →

Question #22

Practice Question

A.A fundamental principle of Chemistry.
B.A complex derivation in JEEMains syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Aldehydes, Ketones a...

Read Full Step-by-Step Solution →

Question #23

Practice Question

A.Acetone
B.Formaldehyde
C.Acetic acid
D.Ethanol

Concept Applied

Tollens' test is for aldehydes; formaldehyde is an aldehyde and reduces Tollens’ reagent....

Read Full Step-by-Step Solution →

Question #24

Practice Question

A.$\varepsilon$‑caprolactone
B.cyclohexanol
C.cyclohexanone oxide
D.cyclohexanecarboxylic acid

Concept Applied

The Baeyer‑Villiger oxidation inserts an oxygen adjacent to the carbonyl carbon. For a cyclic ketone, this expands the ring by one atom, giving a lact...

Read Full Step-by-Step Solution →

Question #25

Practice Question

A.SOCl₂
B.PCl₃
C.PCl₅
D.All of the above

Concept Applied

SOCl₂, PCl₃, and PCl₅ all convert carboxylic acids to acid chlorides....

Read Full Step-by-Step Solution →

Question #26

Practice Question

A.Oxidizing agent
B.Dehydrating agent and catalyst
C.Nucleophile
D.Base catalyst

Concept Applied

Concentrated $H_2SO_4$ protonates the carbonyl oxygen, making the carbon more electrophilic, and also removes water to shift equilibrium toward ester ...

Read Full Step-by-Step Solution →

Question #27

Practice Question

A.$\text{CH}_3\text{CH}_2\text{CHO}$
B.$\text{CH}_3\text{CH(OH)CH}_2\text{CHO}$
C.$\text{CH}_3\text{CH}=\text{CHCHO}$
D.$\text{CH}_3\text{COCH}_3$

Concept Applied

Aldol condensation of acetaldehyde involves nucleophilic addition of enolate to another acetaldehyde molecule, forming 3-hydroxybutanal ($\text{CH}_3\...

Read Full Step-by-Step Solution →

Question #28

Practice Question

A.Ethanol
B.Benzaldehyde
C.Propan-2-one
D.Acetone

Concept Applied

Aromatic aldehydes such as benzaldehyde readily reduce Tollens' reagent, forming a silver mirror. However, due to resonance stabilization, they often ...

Read Full Step-by-Step Solution →

Question #29

Practice Question

A.Protonation of the carbonyl oxygen
B.Nucleophilic attack by ethanol on the protonated carbonyl carbon
C.Loss of water from the tetrahedral intermediate
D.Deprotonation of the oxonium ion to form ester

Concept Applied

Fischer esterification is acid-catalyzed. After protonation of carbonyl, the nucleophilic attack by alcohol on the electrophilic carbon is slow and re...

Read Full Step-by-Step Solution →

Question #30

Practice Question

A.Proton transfer
B.Nucleophilic attack
C.Loss of water
D.Carbocation formation

Concept Applied

Protonation of carbonyl makes it electrophilic; nucleophilic attack is slow....

Read Full Step-by-Step Solution →

Question #31

Practice Question

A.Acetaldehyde
B.Propionaldehyde
C.Benzaldehyde
D.Butanal

Concept Applied

Benzaldehyde lacks $\alpha$-hydrogen atoms....

Read Full Step-by-Step Solution →

Question #32

Practice Question

A.Acetal
B.Cyanohydrin
C.Aldol
D.Hemiacetal

Concept Applied

HCN adds to carbonyl forming cyanohydrin via nucleophilic addition....

Read Full Step-by-Step Solution →

Question #33

Practice Question

A.A fundamental principle of Chemistry.
B.A complex derivation in JEEMains syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Aldehydes, Ketones a...

Read Full Step-by-Step Solution →

Question #34

Practice Question

A.Acetone
B.Formaldehyde
C.Acetic acid
D.Ethanol

Concept Applied

Tollens' test is for aldehydes; formaldehyde is an aldehyde and reduces Tollens’ reagent....

Read Full Step-by-Step Solution →

Question #35

Practice Question

A.$\varepsilon$‑caprolactone
B.cyclohexanol
C.cyclohexanone oxide
D.cyclohexanecarboxylic acid

Concept Applied

The Baeyer‑Villiger oxidation inserts an oxygen adjacent to the carbonyl carbon. For a cyclic ketone, this expands the ring by one atom, giving a lact...

Read Full Step-by-Step Solution →

Question #36

Practice Question

A.SOCl₂
B.PCl₃
C.PCl₅
D.All of the above

Concept Applied

SOCl₂, PCl₃, and PCl₅ all convert carboxylic acids to acid chlorides....

Read Full Step-by-Step Solution →

Question #37

Practice Question

A.Oxidizing agent
B.Dehydrating agent and catalyst
C.Nucleophile
D.Base catalyst

Concept Applied

Concentrated $H_2SO_4$ protonates the carbonyl oxygen, making the carbon more electrophilic, and also removes water to shift equilibrium toward ester ...

Read Full Step-by-Step Solution →

Question #38

Practice Question

A.$\text{CH}_3\text{CH}_2\text{CHO}$
B.$\text{CH}_3\text{CH(OH)CH}_2\text{CHO}$
C.$\text{CH}_3\text{CH}=\text{CHCHO}$
D.$\text{CH}_3\text{COCH}_3$

Concept Applied

Aldol condensation of acetaldehyde involves nucleophilic addition of enolate to another acetaldehyde molecule, forming 3-hydroxybutanal ($\text{CH}_3\...

Read Full Step-by-Step Solution →

Question #39

Practice Question

A.Ethanol
B.Benzaldehyde
C.Propan-2-one
D.Acetone

Concept Applied

Aromatic aldehydes such as benzaldehyde readily reduce Tollens' reagent, forming a silver mirror. However, due to resonance stabilization, they often ...

Read Full Step-by-Step Solution →

Question #40

Practice Question

A.Protonation of the carbonyl oxygen
B.Nucleophilic attack by ethanol on the protonated carbonyl carbon
C.Loss of water from the tetrahedral intermediate
D.Deprotonation of the oxonium ion to form ester

Concept Applied

Fischer esterification is acid-catalyzed. After protonation of carbonyl, the nucleophilic attack by alcohol on the electrophilic carbon is slow and re...

Read Full Step-by-Step Solution →

Question #41

Practice Question

A.Proton transfer
B.Nucleophilic attack
C.Loss of water
D.Carbocation formation

Concept Applied

Protonation of carbonyl makes it electrophilic; nucleophilic attack is slow....

Read Full Step-by-Step Solution →

Question #42

Practice Question

A.Acetaldehyde
B.Propionaldehyde
C.Benzaldehyde
D.Butanal

Concept Applied

Benzaldehyde lacks $\alpha$-hydrogen atoms....

Read Full Step-by-Step Solution →

Question #43

Practice Question

A.Acetal
B.Cyanohydrin
C.Aldol
D.Hemiacetal

Concept Applied

HCN adds to carbonyl forming cyanohydrin via nucleophilic addition....

Read Full Step-by-Step Solution →

Question #44

Practice Question

A.A fundamental principle of Chemistry.
B.A complex derivation in JEEMains syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Aldehydes, Ketones a...

Read Full Step-by-Step Solution →

Question #45

Practice Question

A.Acetone
B.Formaldehyde
C.Acetic acid
D.Ethanol

Concept Applied

Tollens' test is for aldehydes; formaldehyde is an aldehyde and reduces Tollens’ reagent....

Read Full Step-by-Step Solution →

Question #46

Practice Question

A.$\varepsilon$‑caprolactone
B.cyclohexanol
C.cyclohexanone oxide
D.cyclohexanecarboxylic acid

Concept Applied

The Baeyer‑Villiger oxidation inserts an oxygen adjacent to the carbonyl carbon. For a cyclic ketone, this expands the ring by one atom, giving a lact...

Read Full Step-by-Step Solution →

Question #47

Practice Question

A.SOCl₂
B.PCl₃
C.PCl₅
D.All of the above

Concept Applied

SOCl₂, PCl₃, and PCl₅ all convert carboxylic acids to acid chlorides....

Read Full Step-by-Step Solution →

Question #48

Practice Question

A.Oxidizing agent
B.Dehydrating agent and catalyst
C.Nucleophile
D.Base catalyst

Concept Applied

Concentrated $H_2SO_4$ protonates the carbonyl oxygen, making the carbon more electrophilic, and also removes water to shift equilibrium toward ester ...

Read Full Step-by-Step Solution →

Question #49

Practice Question

A.$\text{CH}_3\text{CH}_2\text{CHO}$
B.$\text{CH}_3\text{CH(OH)CH}_2\text{CHO}$
C.$\text{CH}_3\text{CH}=\text{CHCHO}$
D.$\text{CH}_3\text{COCH}_3$

Concept Applied

Aldol condensation of acetaldehyde involves nucleophilic addition of enolate to another acetaldehyde molecule, forming 3-hydroxybutanal ($\text{CH}_3\...

Read Full Step-by-Step Solution →

Question #50

Practice Question

A.Ethanol
B.Benzaldehyde
C.Propan-2-one
D.Acetone

Concept Applied

Aromatic aldehydes such as benzaldehyde readily reduce Tollens' reagent, forming a silver mirror. However, due to resonance stabilization, they often ...

Read Full Step-by-Step Solution →
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