Question

Which of the following is NOT dihydric phenol?

• A. Quinol
• B. Catechol
• C. Phloroglucinol
• D. Resorcinol

Hint:

Quinol (para), catechol (ortho), and resorcinol (meta) are the three common dihydric phenols.

Answer 1

The Correct Option is C

Step 1: Define dihydric phenols.
Dihydric phenols are aromatic compounds containing two hydroxyl ($-OH$) groups attached to a benzene ring.
Step 2: Analyze each option.
(A) Quinol: It contains two hydroxyl groups in para position and is a dihydric phenol.
(B) Catechol: It contains two hydroxyl groups in ortho position and is a dihydric phenol.
(C) Phloroglucinol: It contains three hydroxyl groups and is a trihydric phenol, not dihydric.
(D) Resorcinol: It contains two hydroxyl groups in meta position and is a dihydric phenol.
Step 3: Conclusion.
Phloroglucinol is not a dihydric phenol because it contains three hydroxyl groups.