Chemistry Aldehydes and Ketones Online Mcqs Test

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Question 1

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

Answer

Tollens’ test

Answer

Sodium metal test

Answer

Baeyer’s test

Answer

Bromine water

Question 2

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

Answer

PCC (Pyridinium chlorochromate)

Answer

Grignard reagent

Question 3

3. Which is more reactive toward nucleophilic addition?

Answer

Carboxylic acids

Question 4

4. Which of the following is a secondary alcohol?

Answer

CH₃CH₂OH

Answer

CH₃CH(OH)CH₃

Answer

CH₃CH₂CH₂OH

Question 5

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

Answer

Acetaldehyde

Question 6

6. Aldehydes are more reactive than ketones because:

Answer

They are aromatic

Answer

The carbonyl group is more accessible

Answer

They have more electron-withdrawing groups

Answer

They have stronger C=O bonds

Question 7

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

Answer

Primary alcohol

Answer

Carboxylic acid

Answer

No reaction

Question 8

8. Which of the following compounds is an aldehyde?

Answer

CH₃CH₂OH

Answer

CH₃COCH₃

Question 9

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

Answer

K₂Cr₂O₇ + H₂SO₄

Answer

AgNO₃ + NH₃

Answer

CuSO₄ + NaOH

Answer

Na₂CO₃ + HCl

Question 10

10. Which functional group is present in aldehydes?

Question 11

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

Question 12

12. The carbonyl carbon is:

Answer

Nucleophilic

Answer

Electrophilic

Question 13

13. Which of the following cannot be oxidized easily?

Answer

Benzaldehyde

Question 14

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

Answer

Benzaldehyde

Question 15

15. Which test can distinguish between aldehydes and ketones?

Answer

Sodium test

Answer

Ester test

Answer

Benedict’s test

Answer

Barfoed's test

Question 16

16. What is formed when acetaldehyde reacts with HCN?

Answer

Cyanohydrin

Answer

Propanoic acid

Question 17

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

Answer

–CH₂–

Question 18

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

Answer

Cyanohydrin

Question 19

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

Question 20

20. Aldehydes can be prepared by:

Answer

Reduction of esters

Answer

Oxidation of primary alcohols

Answer

Hydration of alkenes

Answer

Oxidation of ketones

Question 21

21. What is the IUPAC name of CH₃COCH₃?

Answer

Acetaldehyde

Question 22

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

Answer

Hemiacetal

Question 23

23. Aldehydes and ketones react with hydrazine to form:

Answer

Hydrazones

Question 24

24. Ketones resist oxidation because:

Answer

They are less reactive than aldehydes

Answer

They have stable π bonds

Answer

They lack a hydrogen on the carbonyl carbon

Answer

They are already fully oxidized

Question 25

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

Question 26

26. Ketones can be prepared by:

Answer

Combustion of hydrocarbons

Answer

Reduction of carboxylic acids

Answer

Oxidation of secondary alcohols

Answer

Oxidation of primary alcohols

Question 27

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

Answer

Carboxylic acid

Question 28

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

Answer

Dehydration to alkene

Answer

Hydrogenation to alcohol

Answer

Reaction with alcohols

Answer

Formation of cyanohydrins

Question 29

29. The product of reduction of propanal is:

Answer

Propanoic acid

Question 30

30. Aldehydes and ketones both contain:

Answer

Hydroxyl group

Answer

Carboxyl group

Answer

Carbonyl group

Answer

Amino group

Question 31

31. Reduction of a ketone gives:

Answer

Secondary alcohol

Answer

Primary alcohol

Answer

Carboxylic acid

Question 32

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

Answer

Benedict’s reagent

Answer

Lucas reagent

Answer

Fehling’s reagent

Question 33

33. Which of the following shows nucleophilic addition reaction?

Question 34

34. Which of the following is a ketone?

Answer

CH₃CH₂OH

Answer

CH₃COCH₃

Question 35

35. Which reagent can oxidize aldehydes to carboxylic acids?

Answer

Tollens' reagent

Question 36

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

Answer

Hydrazine and base

Question 37

37. Which is more stable: aldehyde or ketone?

Answer

Depends on pH

Answer

Both equal

Question 38

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

Answer

Reduction of aldehyde to alcohol

Answer

Oxidation of silver

Answer

Reduction of Ag⁺ to metallic Ag

Answer

Oxidation of alcohol to ketone

Question 39

39. A ketone with five carbon atoms is:

Question 40

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

Answer

Carbon attached to –OH

Answer

Carbon attached to –COOH

Answer

Carbon in a ring

Answer

Carbon double bonded to oxygen

Question 41

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Total Questions:	40
Time Allowed:	20 Minutes
Total Marks:	40
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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