Question:
Which of the following is a dihydric alcohol?
Which of the following is a dihydric alcohol?
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Count the OH groups in each compound.
Updated On: Oct 1, 2026
- Glycerol
- Ethylene glycol
- Sorbitol
- Methanol
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Alcohols are named by the number of hydroxyl (\(-OH\)) groups: monohydric has one, dihydric has two, trihydric has three, and so on.
Step 2: Count OH groups:
Glycerol \(CH_2OH-CHOH-CH_2OH\) has 3, so it is trihydric. Ethylene glycol \(CH_2OH-CH_2OH\) has 2, so it is dihydric. Sorbitol has 6 OH groups. Methanol \(CH_3OH\) has 1.
Step 3: Conclusion:
Only ethylene glycol is dihydric, option (B).
Final Answer:
Ethylene glycol has two OH groups. \[ \boxed{B:\ \text{Ethylene glycol}} \]
Alcohols are named by the number of hydroxyl (\(-OH\)) groups: monohydric has one, dihydric has two, trihydric has three, and so on.
Step 2: Count OH groups:
Glycerol \(CH_2OH-CHOH-CH_2OH\) has 3, so it is trihydric. Ethylene glycol \(CH_2OH-CH_2OH\) has 2, so it is dihydric. Sorbitol has 6 OH groups. Methanol \(CH_3OH\) has 1.
Step 3: Conclusion:
Only ethylene glycol is dihydric, option (B).
Final Answer:
Ethylene glycol has two OH groups. \[ \boxed{B:\ \text{Ethylene glycol}} \]
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