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Class 12 Chemistry (Part Ii) Chapter 12 Aldehydes Quiz 2 (25 MCQs)

Quiz Instructions

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1. Explain the effect of branching on the boiling point of ketones.

Correct Answer: A) Branching decreases the boiling point of ketones.

2. What observation suggests a gas is being produced when ethanoic acid reacts with sodium carbonate?

Correct Answer: C) Fizzing or bubbling.

3. What is the difference between aldehyde and ketones?b. position of C atomsc. the number of bonds carbon can formd. the number of oxygen atoms

Correct Answer: A) A. position of C=O group.

4. What is the role of acetyl chloride in Friedel-Crafts Acylation?

Correct Answer: B) Acetyl chloride acts as the acylating agent by forming an acylium ion in the presence of a Lewis acid catalyst.

5. What is the color & formula of the ppt formed when Acetone reacted with Iodine & NaOH?

Correct Answer: D) Yellow & CHI$_{3}$.

6. Salicylaldehyde can be produced directly from phenol.

Correct Answer: B) False.

7. The products of the reaction of a carboxylic acid and an alcohol would be

Correct Answer: D) Ester and water.

8. Acetone is a(n)

Correct Answer: B) Ketone.

9. What is the chemical name for Brady's reagent?

Correct Answer: C) 2, 4-dinitrophenyhydrazine.

10. Select carbonyl compounds from the following formulae:

Correct Answer: B) C$_{4}$H$_{8}$O.

11. What is the general formula for carboxylic acids?

Correct Answer: C) CnH2nO2.

12. What is the main product when ethanoic acid reacts with ethanol in the presence of an acid catalyst?

Correct Answer: A) Ethyl ethanoate.

13. Which statement helps to explain why chloroethanoic acid is a stronger acid than ethanoic acid?

Correct Answer: A) Chlorine exerts an electron-withdrawing effect to stabilise the chloroethanoate ion.

14. Which of the following acids is the most soluble in water?

Correct Answer: A) Ethanoic acid.

15. What observation confirms the presence of hydrogen gas?

Correct Answer: C) A 'pop' sound with a lighted taper.

16. Discuss the solubility of carboxylic acids in water.

Correct Answer: D) Carboxylic acids are soluble in water.

17. Which one is a good reducing agent?

Correct Answer: C) NaBH$_{4}$.

18. In Tollen's test, what happens to the silver ions (Ag+)?

Correct Answer: C) They are reduced to silver metal.

19. Which of the following organic compound shows rapid reaction with sodium nitroprusside?

Correct Answer: A) Acetone.

20. The number of carbon atoms present in glutaric acid is

Correct Answer: C) 5.

21. The acidity of carboxylic acids is stronger than that of alcohols because of:

Correct Answer: B) Presence of a hydroxyl group.

22. Which aldehyde is a gas at room temperature?

Correct Answer: B) Formaldehyde.

23. The following statement is NOT suitable for Cannizzaro's reaction.

Correct Answer: C) In presence of dilute alkali.

24. Compare the acidity of carboxylic acids with alcohols.

Correct Answer: A) Carboxylic acids are more acidic than alcohols.

25. When the carbonyl group of a neutral ketones get protonated:

Correct Answer: A) The resulting species becomes more electrophilic.

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