Question:
Which of the following is NOT dihydric phenol?
Which of the following is NOT dihydric phenol?
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Dihydric phenols have two hydroxyl groups on a benzene ring. \( \alpha \)-naphthol only has one.
Updated On: Jan 27, 2026
- \( \alpha \)-naphthol
- Resorcinol
- Hydroquinone
- Catechol
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The Correct Option is A
Solution and Explanation
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.
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.
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