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How is glycerol (propane-1,2,3-triol) classified by the number of –OH groups it contains?

AMonohydric alcohol
BDihydric alcohol
CTrihydric alcohol
DPhenol
Answer & Solution
Correct answer: C. Trihydric alcohol
Glycerol has three hydroxyl groups (on C1, C2 and C3), making it a **trihydric** alcohol. Monohydric carries one –OH (e.g. ethanol) dihydric two (e.g. ethylene glycol).
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