Chapter Exam

Chapter 11: Hydroxy Compounds and Ethers — Online MCQ Test

Q: Which reagent is used to distinguish phenol from alcohol by giving a violet colour?

Answer: A. Neutral FeCl3 — Phenols form a coloured complex with neutral ferric chloride, often giving violet, blue, green, or purple colours. Ordinary alcohols do not show this test.

Q: What is the common name of C6H5OH?

Answer: B. Phenol — C6H5OH is hydroxyl benzene, commonly called phenol. It is an aromatic hydroxy compound.

Q: Which of the following compounds is the most acidic?

Answer: B. Phenol — Phenol is more acidic than alcohols because the phenoxide ion is resonance-stabilized. Alcohols lack this stabilization, so they are much less acidic.

Q: Which reagent is used to convert alcohols into alkyl halides without rearrangement and is commonly used in board-level synthesis questions?

Answer: B. SOCl2 — Thionyl chloride converts alcohols into alkyl chlorides smoothly, and the by-products are gases, which drive the reaction forward. It is preferred in many synthesis problems.

CHEMISTRY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 11: Hydroxy Compounds and Ethers with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th CHEMISTRY. This chapter covers: Focusing on organic oxygen compounds this chapter details synthesis reactions and chemical tests for alcohols phenols and ethers. It covers acidity trends named reactions and indus.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 11: Hydroxy Compounds and Ethers — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th CHEMISTRY — Chapter 11: Hydroxy Compounds and Ethers, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which reagent is used to distinguish phenol from alcohol by giving a violet colour?

A. Neutral FeCl3 ✓
B. Br2 water
C. Tollen's reagent
D. NaHCO3

Answer: A. Neutral FeCl3
Phenols form a coloured complex with neutral ferric chloride, often giving violet, blue, green, or purple colours. Ordinary alcohols do not show this test.

What is the common name of C6H5OH?

A. Benzyl alcohol
B. Phenol ✓
C. Anisole
D. Benzoic acid

Answer: B. Phenol
C6H5OH is hydroxyl benzene, commonly called phenol. It is an aromatic hydroxy compound.

Which of the following compounds is the most acidic?

A. Ethanol
B. Phenol ✓
C. Methane
D. Ethane

Answer: B. Phenol
Phenol is more acidic than alcohols because the phenoxide ion is resonance-stabilized. Alcohols lack this stabilization, so they are much less acidic.

Which of the following is NOT a property of ethers?

A. They are relatively less reactive than alcohols
B. They can form hydrogen bonds with water as donors ✓
C. They are good solvents for many organic compounds
D. They are generally volatile and inflammable

Answer: B. They can form hydrogen bonds with water as donors
Ethers can accept hydrogen bonds from water but cannot donate hydrogen bonds because they do not contain an O–H bond. Hence, option B is incorrect.

Which reagent is used to convert alcohols into alkyl halides without rearrangement and is commonly used in board-level synthesis questions?

A. PCl5
B. SOCl2 ✓
C. NaBH4
D. AgNO3

Answer: B. SOCl2
Thionyl chloride converts alcohols into alkyl chlorides smoothly, and the by-products are gases, which drive the reaction forward. It is preferred in many synthesis problems.