Home › JEE Main › Chemistry › Alcohols, Phenols and Ethers › How is glycerol (propane-1,2,3-triol) classified…
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).
Related questions
Hydroboration-oxidation of propene CH$_3$-CH=CH$_2$ on the lab gives:The Williamson ether synthesis works best with:Heating ethanol with concentrated $H_2SO_4$ at $170^\circ$C on the lab burner gives:Phenol is more acidic than ethanol because:Phenol gives the iodoform test (yellow precipitate) when treated with I₂/NaOH:The Williamson ether synthesis involves:The dehydration of ethanol with concentrated H₂SO₄ at 443 K gives:Phenol reacts with **NaOH** but ethanol does NOT (with dilute aqueous NaOH). This is becau