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Class 12 Chemistry (Part Ii) Chapter 12 Aldehydes Quiz 9 (25 MCQs)

Quiz Instructions

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1. Which of the following compounds is an aldehyde?

Correct Answer: A) Methanal.

2. Catalyst SnCl / HCl 2 is used in

Correct Answer: A) Stephen's reduction.

3. Which of the following statements concerning hydrogen bond is CORRECT?

Correct Answer: D) Neither ketone molecules nor aldehyde molecules can hydrogen bond to each other.

4. What charge do the green chromium ions, formed during the reduction of potassium dichromate(VI) ions, have?

Correct Answer: A) +3.

5. Which statements about butanone is correct?

Correct Answer: D) Butanone forms yellow ppt with iodoform test.

6. The mechanism that you need to learn for aldehydes and ketones is called

Correct Answer: B) Nucleophilic addition.

7. Main product formed by a reaction between butanal and Tollen's reagent

Correct Answer: B) Butanoic acid.

8. Which of these compounds does not react with Brady's reagent?

Correct Answer: C) Propanol.

9. Boiling points of carboxylic acids is higher than those of corresponding alcohols is due to

Correct Answer: C) Strong hydrogen bonded dimer.

10. The ketonic fuctional group present in 3-oxobutanal is on ..... carbon atom

Correct Answer: C) 3.

11. Assertion (A):Formaldehyde undergoesAldol condensation.Reason (R):Formaldehyde does not contain an a-hydrogen.

Correct Answer: C) Assertion (A) is true, but Reason (R) is false.

12. Arrange the boiling point of the following compounds in increasing order.Ethane, ethanol, ethanal

Correct Answer: A) Ethane

13. LAH cannot be used to convert carboxylic acid to the corresponding aldehyde because

Correct Answer: D) RCOOH is reduced to RCH2OH.

14. What is the name of C$_{4}$$_{ }$H$_{9}$COOH

Correct Answer: C) Pentanoic acid.

15. Which one(s) of given statements is/are correct?

Correct Answer: C) Aldehydes have lower boiling points when compared with corresponding alcohols.

16. What is the IUPAC name for the compound with the formula $CH_3COCH_3$

Correct Answer: B) Propanone.

17. Formula of Propanoic acid is

Correct Answer: C) CH$_{3}$CH$_{2}$COOH.

18. Potassium dichromate is an oxidising agent which can be used to completely oxidise an aldehyde. What is the correct formula of potassium dichromate

Correct Answer: C) K$_{2}$Cr$_{2}$O$_{7}$.

19. All of the following reactions are reversible, except?

Correct Answer: C) Reduction of an aldehyde via LiAlH4.

20. What is the key step in the ozonolysis of alkenes to form aldehydes or ketones?

Correct Answer: A) Cleavage of the carbon-carbon double bond by ozone.

21. Discuss the odor of aldehydes and ketones.

Correct Answer: D) Aldehydes have a strong, pungent odor described as fruity or flowery, while ketones have a sweet, acetone-like smell.

22. Which of the following reaction is not shown by acetone?

Correct Answer: C) Reaction with Fehling's solution.

23. How can carboxylic acids be prepared from nitriles?

Correct Answer: B) Hydrolysis of nitriles.

24. What observation indicates a positive Tollen's test?

Correct Answer: C) Silver mirror forms on the test tube.

25. The compound with the highest acidity in the following is

Correct Answer: D) 4-nitrobenzoic acid.

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