Chapter Exam

Chapter 12: Carbonyl Compounds and Carboxylic Acids — Online MCQ Test

Q: Which reagent is commonly used to convert an alcohol to an aldehyde or ketone under controlled oxidation in this chapter?

Answer: A. PCC — PCC is a mild oxidizing agent that can oxidize primary alcohols to aldehydes and secondary alcohols to ketones without over-oxidation.

Q: The functional group present in carboxylic acids is:

Answer: B. -COOH — Carboxylic acids contain the carboxyl group, written as -COOH.

Q: Which reagent can distinguish between acetaldehyde and acetone by giving a positive result only with acetaldehyde?

Answer: A. Fehling's solution — Fehling's solution is reduced by aliphatic aldehydes like acetaldehyde, but not by ketones such as acetone.

Q: Which acid derivative is least reactive toward nucleophilic acyl substitution?

Answer: D. Amide — Amides are least reactive because the nitrogen donates electron density by resonance, making the carbonyl carbon less electrophilic.

CHEMISTRY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 12: Carbonyl Compounds and Carboxylic Acids with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th CHEMISTRY. This chapter covers: This chapter covers preparation methods and reactivity of aldehydes ketones carboxylic acids and acid derivatives. Students explore nucleophilic addition reactions condensation rea.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 12: Carbonyl Compounds and Carboxylic Acids — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th CHEMISTRY — Chapter 12: Carbonyl Compounds and Carboxylic Acids, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which reagent is commonly used to convert an alcohol to an aldehyde or ketone under controlled oxidation in this chapter?

A. PCC ✓
B. NaBH4
C. LiAlH4
D. H2/Pd

Answer: A. PCC
PCC is a mild oxidizing agent that can oxidize primary alcohols to aldehydes and secondary alcohols to ketones without over-oxidation.

The functional group present in carboxylic acids is:

A. -CHO
B. -COOH ✓
C. -OH
D. -CO-

Answer: B. -COOH
Carboxylic acids contain the carboxyl group, written as -COOH.

Which reagent can distinguish between acetaldehyde and acetone by giving a positive result only with acetaldehyde?

A. Fehling's solution ✓
B. H2/Ni
C. NaOH
D. Dilute HCl

Answer: A. Fehling's solution
Fehling's solution is reduced by aliphatic aldehydes like acetaldehyde, but not by ketones such as acetone.

Which statement is correct regarding the reactivity of aldehydes and ketones toward nucleophilic addition?

A. Ketones are generally more reactive than aldehydes due to less steric hindrance
B. Aldehydes are generally more reactive than ketones due to less steric hindrance and less +I effect ✓
C. Both are equally reactive because they contain the same carbonyl group
D. Ketones do not undergo nucleophilic addition

Answer: B. Aldehydes are generally more reactive than ketones due to less steric hindrance and less +I effect
Aldehydes are more reactive because they have one alkyl group and one hydrogen, so they suffer less steric hindrance and less electron donation than ketones.

Which acid derivative is least reactive toward nucleophilic acyl substitution?

A. Acid chloride
B. Acid anhydride
C. Ester
D. Amide ✓

Answer: D. Amide
Amides are least reactive because the nitrogen donates electron density by resonance, making the carbonyl carbon less electrophilic.

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Chapter 13: Organic Nitrogen Compounds