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How many primary hydroxyl groups does glucose have?

Question and options

How many primary hydroxyl groups does glucose have?
  1. 5
  2. 0
  3. 1
  4. 4

Answer and explanation

Correct answer: C - 1
Glucose has five OH groups; only the C6 CH2OH\mathrm{CH_2OH} is primary, the others are secondary (C1 is a hemiacetal OH in the ring form). So 1.

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