Question

Which of the following is NOT dihydric phenol?

• A. \( \alpha \)-naphthol
• B. Resorcinol
• C. Hydroquinone
• D. Catechol

Hint:

Dihydric phenols have two hydroxyl groups on a benzene ring. \( \alpha \)-naphthol only has one.

Answer 1

The Correct Option is A

Step 1: Understanding dihydric phenols.
Dihydric phenols have two hydroxyl (-OH) groups attached to a benzene ring. Hydroquinone, resorcinol, and catechol all have two hydroxyl groups.

Step 2: Analyzing the options.
(A) \( \alpha \)-naphthol: \( \alpha \)-naphthol is a phenol with only one hydroxyl group, so it is not a dihydric phenol.
(B) Resorcinol: Resorcinol is a dihydric phenol with two hydroxyl groups at positions 1 and 3.
(C) Hydroquinone: Hydroquinone is a dihydric phenol with two hydroxyl groups at positions 1 and 4.
(D) Catechol: Catechol is a dihydric phenol with two hydroxyl groups at positions 1 and 2.

Step 3: Conclusion.
The correct answer is (A) \( \alpha \)-naphthol as it is not a dihydric phenol.