Home/Chemistry Mcqs/Chemistry Aldehydes and Ketones Online Mcqs Test

Chemistry Aldehydes and Ketones Online Mcqs Test

Mustansar KhanLast Updated: October 14, 2025

Important Chemistry Aldehydes and Ketones Question and Answer

Total Questions:	40
Time Allowed:	20 Minutes
Total Marks:	40
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	MDCAT Entry Test Chemistry Online Test Interview Questions about Chemisttry All Universities Entrance Test Recruitments Tests

Chemistry Aldehydes and Ketones Practice Test Online With Explanation

Please wait...

Page 1 of 2

Uncategorized

1. Which of the following cannot be oxidized easily?

Benzaldehyde

Propanone

Methanal

Ethanal

2. Which of the following compounds is an aldehyde?

CH₃COOH

CH₃COCH₃

CH₃CH₂OH

CH₃CHO

3. What is formed when acetaldehyde reacts with HCN?

Alcohol

Ester

Cyanohydrin

Propanoic acid

4. Which is more stable: aldehyde or ketone?

Depends on pH

Ketone

Aldehyde

Both equal

5. A ketone with five carbon atoms is:

Pentanal

Pentanone

Hexanal

Butanone

6. Reduction of a ketone gives:

Carboxylic acid

Primary alcohol

Aldehyde

Secondary alcohol

7. What is the product of oxidation of a ketone?

Carboxylic acid

No reaction

Ether

Primary alcohol

8. Which of the following gives a positive Fehling’s test?

Acetone

Methanal

Propanone

Benzaldehyde

9. What is the IUPAC name of CH₃COCH₃?

Ethanal

Acetaldehyde

Propanone

Methanal

10. What is the product when an aldehyde is reduced?

Ether

Ketone

Carboxylic acid

Alcohol

11. Ketones can be prepared by:

Combustion of hydrocarbons

Reduction of carboxylic acids

Oxidation of primary alcohols

Oxidation of secondary alcohols

12. Which group is common in both aldehydes and ketones?

–CH₂–

–CO–

–OH

–COOH

13. Which of the following is a ketone?

CH₃CH₂OH

CH₃COCH₃

CH₃CHO

CH₃COOH

14. Which of the following is NOT a nucleophilic addition reaction?

Hydrogenation to alcohol

Reaction with alcohols

Formation of cyanohydrins

Dehydration to alkene

15. Which test can distinguish between aldehydes and ketones?

Sodium test

Barfoed's test

Ester test

Benedict’s test

16. Which of the following is oxidized to give acetic acid?

Propanone

Ethanol

Acetaldehyde

Acetone

17. What is formed when an aldehyde reacts with alcohol under acidic conditions?

Ether

Aldol

Hemiacetal

Ester

18. Which of the following is used for the detection of carbonyl group?

Lucas reagent

2,4-DNP

Benedict’s reagent

Fehling’s reagent

19. The carbonyl carbon is:

Nucleophilic

Neutral

Aromatic

Electrophilic

20. Which of the following is a product of base-catalyzed nucleophilic addition to a ketone?

Alkane

Oxime

Cyanohydrin

Alcohol

21. Which compound is used in the silver mirror test?

AgNO₃ + NH₃

K₂Cr₂O₇ + H₂SO₄

CuSO₄ + NaOH

Na₂CO₃ + HCl

22. Which is more reactive toward nucleophilic addition?

Ketones

Alkanes

Aldehydes

Carboxylic acids

23. Which reagent can oxidize aldehydes to carboxylic acids?

NaOH

FeCl₂

H₂/Ni

Tollens' reagent

24. Aldehydes and ketones both contain:

Hydroxyl group

Carboxyl group

Amino group

Carbonyl group

25. Which of the following is a nucleophile in nucleophilic addition?

NO₂

H⁺

CN⁻

H₂O

Page 2 of 2

26. Which test is positive for aldehydes but not ketones?

Tollens’ test

Baeyer’s test

Sodium metal test

Bromine water

27. Ketones resist oxidation because:

They lack a hydrogen on the carbonyl carbon

They are already fully oxidized

They are less reactive than aldehydes

They have stable π bonds

28. Aldehydes and ketones react with hydrazine to form:

Oximes

Alcohol

Hydrazones

Esters

29. Which functional group is present in aldehydes?

–COOH

–OH

–CHO

–C=O–

30. Aldehydes can be prepared by:

Hydration of alkenes

Oxidation of primary alcohols

Oxidation of ketones

Reduction of esters

31. In Tollens' test, the silver mirror forms due to:

Reduction of aldehyde to alcohol

Oxidation of alcohol to ketone

Oxidation of silver

Reduction of Ag⁺ to metallic Ag

32. Which carbon is the carbonyl carbon in aldehydes and ketones?

Carbon attached to –OH

Carbon double bonded to oxygen

Carbon in a ring

Carbon attached to –COOH

33. Which reagent is used in the Wolff–Kishner reduction?

KMnO₄

NaBH₄

H₂SO₄

Hydrazine and base

34. The product of reduction of propanal is:

Propanone

Propanoic acid

Ethanol

Propanol

35. Which of the following is a secondary alcohol?

CH₃OH

CH₃CH₂CH₂OH

CH₃CH(OH)CH₃

CH₃CH₂OH

36. Which reagent is commonly used to reduce aldehydes to alcohols?

KMnO₄

NaCl

H₂/Pt

FeCl₃

37. Which of the following shows nucleophilic addition reaction?

Alkane

Aldehyde

Alkyne

Alkene

38. Which of the following is used in the preparation of aldehydes?

HCl

PCC (Pyridinium chlorochromate)

Grignard reagent

NaBH₄

39. Aldehydes are more reactive than ketones because:

They are aromatic

They have more electron-withdrawing groups

The carbonyl group is more accessible

They have stronger C=O bonds

40. Which of the following is the IUPAC name for CH₃CHO?

Methanal

Propanal

Ethanal

Acetone

You Can Learn and Gain more Knowledge through our Online Quiz and Testing system Just Search your desired Preparation subject at Gotest.

Basic Concepts of Chemistry Online Mcqs Test
Chemistry Industrial Chemistry Online Mcqs Test
Chemistry Alcohols And Phenols Online Mcqs Test
Chemistry Alkyl Halides Online Mcqs Test
Chemistry Macro Molecules Online Mcqs Test
Chemistry Carboxylic Acid Online Mcqs Test
Chemistry of Hydrocarbons Online Mcqs Test
Chemistry Transition Elements Online Mcqs Test
Chemistry Reaction Kinetics Online Mcqs Test
Fundamental Principles of Organic Chemistry Online Mcqs Test

Mustansar KhanLast Updated: October 14, 2025

Chemistry Aldehydes and Ketones Online Mcqs Test

Important Chemistry Aldehydes and Ketones Question and Answer

Chemistry Aldehydes and Ketones Practice Test Online With Explanation

Uncategorized

Related Posts

Mustansar Khan

Leave a Reply Cancel reply