Question:
Which of the following is NOT dihydric alcohol?
Which of the following is NOT dihydric alcohol?
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Memorize the isomer names for polyhydric phenols: Catechol, Resorcinol, and Hydroquinone are the ortho-, meta-, and para- isomers of dihydroxybenzene, respectively. Phloroglucinol stands out uniquely as a symmetric trihydroxybenzene.
Updated On: Jun 12, 2026
- Catechol
- Hydroquinone
- Phloroglucinol
- Resorcinol
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
The question asks us to identify which of the given choices is not classified as a dihydric alcohol (a compound containing exactly two hydroxyl -OH groups).
Step 2: Key Formula or Approach:
Analyze the chemical structures and count the total number of hydroxyl groups attached to the aromatic benzene ring for each option.
Step 3: Detailed Explanation:
1.
Catechol: This is Benzene-1,2-diol. It contains 2 -OH groups (dihydric).
2.
Hydroquinone: This is Benzene-1,4-diol. It contains 2 -OH groups (dihydric).
3.
Resorcinol: This is Benzene-1,3-diol. It contains 2 -OH groups (dihydric).
4.
Phloroglucinol: This is Benzene-1,3,5-triol. It contains 3 distinct -OH groups distributed around the aromatic ring, making it a trihydric phenol, not a dihydric one.
Step 4: Final Answer:
Phloroglucinol is a trihydric phenol and therefore is not a dihydric alcohol, which corresponds to option (C).
The question asks us to identify which of the given choices is not classified as a dihydric alcohol (a compound containing exactly two hydroxyl -OH groups).
Step 2: Key Formula or Approach:
Analyze the chemical structures and count the total number of hydroxyl groups attached to the aromatic benzene ring for each option.
Step 3: Detailed Explanation:
1.
Catechol: This is Benzene-1,2-diol. It contains 2 -OH groups (dihydric).
2.
Hydroquinone: This is Benzene-1,4-diol. It contains 2 -OH groups (dihydric).
3.
Resorcinol: This is Benzene-1,3-diol. It contains 2 -OH groups (dihydric).
4.
Phloroglucinol: This is Benzene-1,3,5-triol. It contains 3 distinct -OH groups distributed around the aromatic ring, making it a trihydric phenol, not a dihydric one.
Step 4: Final Answer:
Phloroglucinol is a trihydric phenol and therefore is not a dihydric alcohol, which corresponds to option (C).
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