Question:
Identify the structural formula of phloroglucinol.
Identify the structural formula of phloroglucinol.
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Phloroglucinol is benzene with three hydroxyl groups at alternate positions.
Updated On: Nov 13, 2026
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Phloroglucinol is a trihydric phenol with the IUPAC name benzene-1,3,5-triol.
Step 2: Positions of the OH groups
The three OH groups are on carbons 1, 3 and 5, so each is separated from the next by one ring carbon and the molecule is symmetrical.
Step 3: Compare the figures
Pyrogallol has OH groups at 1, 2 and 3, another figure has OH groups at 1, 2 and 4, and the last figure is resorcinol with only two OH groups. The figure with OH groups at alternate corners is phloroglucinol.
Final Answer:
Phloroglucinol is benzene-1,3,5-triol. \[ \boxed{\text{(A) }\text{benzene-1,3,5-triol}} \]
Phloroglucinol is a trihydric phenol with the IUPAC name benzene-1,3,5-triol.
Step 2: Positions of the OH groups
The three OH groups are on carbons 1, 3 and 5, so each is separated from the next by one ring carbon and the molecule is symmetrical.
Step 3: Compare the figures
Pyrogallol has OH groups at 1, 2 and 3, another figure has OH groups at 1, 2 and 4, and the last figure is resorcinol with only two OH groups. The figure with OH groups at alternate corners is phloroglucinol.
Final Answer:
Phloroglucinol is benzene-1,3,5-triol. \[ \boxed{\text{(A) }\text{benzene-1,3,5-triol}} \]
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