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Alcohols, Phenols and Ethers CBSE Class 12 MCQ & Practice Questions

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Alcohols, Phenols and Ethers Revision Guide for CBSE Class 12 Chemistry

Alcohols, Phenols and Ethers is part of CBSE Class 12 Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

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Top 20 Alcohols, Phenols and Ethers MCQs with Answers

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CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

1. The IUPAC name of CH₃CH₂OH is:

  • A. Methanol
  • B. Ethanol
  • C. Ethanal
  • D. Ethanoic acid
Answer: B
Explanation: CH₃CH₂OH is a two-carbon alcohol, ethanol.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

2. The functional group of alcohols is:

  • A. –CHO
  • B. –OH
  • C. –COOH
  • D. –O–
Answer: B
Explanation: Alcohols contain the hydroxyl group.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

3. The functional group of ethers is:

  • A. –O–
  • B. –OH
  • C. –CO–
  • D. –CHO
Answer: A
Explanation: Ethers contain an oxygen atom bonded to two carbon groups.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

4. The IUPAC name of CH₃OCH₃ is:

  • A. Methoxymethane
  • B. Dimethyl alcohol
  • C. Ethoxyethane
  • D. Methanal
Answer: A
Explanation: CH₃OCH₃ is named methoxymethane.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

5. Which alcohol is tertiary?

  • A. CH₃OH
  • B. CH₃CH₂OH
  • C. (CH₃)₂CHOH
  • D. (CH₃)₃COH
Answer: D
Explanation: In tert-butanol, the carbon bearing –OH is attached to three carbon atoms.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

6. Lucas reagent is a mixture of:

  • A. Conc. HCl and anhydrous ZnCl₂
  • B. Dilute HCl and NaCl
  • C. H₂SO₄ and K₂Cr₂O₇
  • D. NaOH and CuO
Answer: A
Explanation: Lucas reagent is concentrated HCl containing anhydrous ZnCl₂.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

7. A tertiary alcohol gives turbidity with Lucas reagent:

  • A. Immediately
  • B. After 5 minutes
  • C. Only on heating
  • D. Never
Answer: A
Explanation: Tertiary alcohols form alkyl chlorides rapidly via stable carbocations.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

8. Oxidation of a primary alcohol first gives:

  • A. Ketone
  • B. Aldehyde
  • C. Ether
  • D. Alkene
Answer: B
Explanation: Primary alcohols oxidise first to aldehydes.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

9. Oxidation of a secondary alcohol gives:

  • A. Aldehyde
  • B. Ketone
  • C. Carboxylic acid directly
  • D. Ether
Answer: B
Explanation: Secondary alcohols oxidise to ketones.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

10. A tertiary alcohol is resistant to mild oxidation mainly because:

  • A. It has no oxygen
  • B. It lacks an alpha-hydrogen on the carbon bearing –OH
  • C. It is ionic
  • D. It contains a double bond
Answer: B
Explanation: Oxidation normally requires a hydrogen on the carbinol carbon.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

11. Dehydration of ethanol with concentrated H₂SO₄ at about 443 K gives:

  • A. Ethane
  • B. Ethene
  • C. Ethanal
  • D. Diethyl ether
Answer: B
Explanation: Intramolecular dehydration at higher temperature forms ethene.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

12. Dehydration of ethanol with concentrated H₂SO₄ at about 413 K mainly gives:

  • A. Ethene
  • B. Diethyl ether
  • C. Ethanal
  • D. Ethanoic acid
Answer: B
Explanation: Intermolecular dehydration at lower temperature forms ether.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

13. Phenol is more acidic than ethanol because:

  • A. Phenoxide ion is resonance-stabilised
  • B. Ethanol has no hydrogen
  • C. Phenol is ionic
  • D. Ethoxide ion is more stable
Answer: A
Explanation: The phenoxide ion delocalises negative charge over the aromatic ring.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

14. Which is the most acidic?

  • A. Ethanol
  • B. Phenol
  • C. p-Nitrophenol
  • D. p-Cresol
Answer: C
Explanation: The electron-withdrawing nitro group stabilises the phenoxide ion.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

15. Electron-donating groups on phenol generally:

  • A. Increase acidity
  • B. Decrease acidity
  • C. Have no effect
  • D. Make it neutral
Answer: B
Explanation: Electron donation destabilises phenoxide ion and lowers acidity.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

16. Phenol reacts with bromine water to form:

  • A. Bromobenzene
  • B. 2,4,6-Tribromophenol
  • C. p-Bromophenol only
  • D. No reaction
Answer: B
Explanation: The strongly activating –OH group leads to tribromination in bromine water.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

17. Phenol with neutral FeCl₃ gives:

  • A. Green gas
  • B. Violet colour
  • C. White precipitate
  • D. No change
Answer: B
Explanation: Phenol forms a violet-coloured complex with ferric ions.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

18. Kolbe's reaction of sodium phenoxide with CO₂ gives mainly:

  • A. Benzoic acid
  • B. Salicylic acid
  • C. Phenyl acetate
  • D. Anisole
Answer: B
Explanation: Carboxylation occurs mainly at the ortho position to form salicylic acid.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

19. Reimer–Tiemann reaction converts phenol into mainly:

  • A. Benzaldehyde
  • B. Salicylaldehyde
  • C. Benzoic acid
  • D. Anisole
Answer: B
Explanation: Phenol reacts with CHCl₃/NaOH to introduce –CHO mainly at the ortho position.

CBSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

20. Williamson ether synthesis involves reaction of:

  • A. Alcohol with acid
  • B. Alkoxide with alkyl halide
  • C. Phenol with CO₂
  • D. Ether with HI only
Answer: B
Explanation: An alkoxide ion undergoes nucleophilic substitution with a suitable alkyl halide.

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