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KCET2026ChemistryAlcohols Phenols and Ethers

Glycerol is a trihydric alcohol. It contains ____.

Options

  1. AOne primary, one secondary and one tertiary alcoholic groups
  2. BTwo primary and one secondary alcoholic groups
  3. CTwo secondary and one primary alcoholic groups
  4. DOne primary and two tertiary alcoholic groups

Correct answer

B. Two primary and one secondary alcoholic groups

Step-by-step solution

The chemical formula of glycerol is CH₂(OH)-CH(OH)-CH₂(OH) . The two terminal -OH groups are attached to primary carbon atoms ( -CH₂- ), making them primary alcoholic groups. The middle -OH group is attached to a secondary carbon atom ( -CH- ), making it a secondary alcoholic group. Therefore, glycerol contains two primary and one secondary alcoholic groups. Answer: Two primary and one secondary alcoholic groups

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