Chapter 11: Hydroxy Compounds and Ethers — Online MCQ Test
CHEMISTRY · CLASS 12th · Tamil Nadu State Board
Practice Chapter 11: Hydroxy Compounds and Ethers with a free chapter-wise online MCQ test.
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.
Chapter 11: Hydroxy Compounds and Ethers — Important Questions & Answers
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.
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.
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.
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.
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.
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.