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Class 12 Chemistry (Part Ii) Chapter 12 Aldehydes Quiz 6 (25 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. Oxidation of secondary alcohol with chromic acid results in the production of .....

Correct Answer: B) A ketone.

2. Propanone is very soluble in water because

Correct Answer: B) It can form hydrogen bond with water molecule.

3. The compound among the following NOT oxidised by Fehling solution is .....

Correct Answer: B) Benzaldehyde.

4. What is the key chemical difference between aldehydes and ketones?

Correct Answer: C) Aldehydes are easily oxidised, ketones are not.

5. Aldehydes can be prepared from conversion of arines.

Correct Answer: A) True.

6. Which of the following is/are correct use(s) of alcohols?I. FuelII. SolventIII. Starting material for plastic substances

Correct Answer: B) I and II only.

7. What is the key difference between the hydration of alkynes and alkenes in terms of products formed?

Correct Answer: C) Alkynes undergo two additions of water molecules, forming ketones or aldehydes, while alkenes undergo a single addition to form alcohols.

8. Reactivity order towards nucleophilic addition reaction is

Correct Answer: A) Formaldehyde>Acetaldehyde>Propanal>Acetone.

9. Which of the following compounds is the most acidic?

Correct Answer: C) Butanal.

10. What is the purpose of the Gattermann-Koch reaction in aldehyde and ketone synthesis?

Correct Answer: A) To introduce a formyl group onto an aromatic ring for aldehyde and ketone synthesis.

11. Which of the following is an isomer of acetone?

Correct Answer: D) Propanal.

12. Which is the strongest acid out of these 4 compounds?

Correct Answer: B) CH$_{3}$CHFCOOH.

13. Which carboxylic acid is most acidic?

Correct Answer: B) CH$_{3}$CH$_{2}$CH(Cl)COOH.

14. Aldehydes and ketones can be oxidized.

Correct Answer: B) False.

15. The IUPAC name for CH3CH2CH2CHO is:

Correct Answer: A) Butanal.

16. Test for aldehyde

Correct Answer: A) Add Tollen's reagent, warm to produce a silver mirror.

17. Carboxylic acids are produced by the oxidation of .....

Correct Answer: A) Alcohols.

18. What functional group is present in the intermediate formed during the reaction of Grignard reagents with carbonyl compounds?

Correct Answer: C) Alkoxide group (-OR).

19. When aldehyde is heated with Fehling's solution, it gives a precipitate of

Correct Answer: A) Cu$_{2}$O.

20. Which organ breaks down alcohol?

Correct Answer: A) Liver.

21. Compare the boiling points of carboxylic acids with aldehydes and ketones.

Correct Answer: A) Carboxylic acids have higher boiling points than aldehydes and ketones.

22. Which of the following species can attack the carbon atom in the carbonyl group, C=O?

Correct Answer: C) CN$^{-}$.

23. What is the purpose of the Rosenmund reaction in aldehyde preparation?

Correct Answer: A) To convert acyl chlorides to aldehydes.

24. Type of mechanism that aldehydes and ketones undergo

Correct Answer: B) Nucleophilic addition.

25. What type of chemical reaction do aldehydes undergo with Tollens' reagent?

Correct Answer: D) Redox reaction.

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