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JAMB Chemistry 1991 Question 47

Question 47

Alkanols

A certain liquid has a high boiling point. It is viscous, non-toxic, miscible with water being very hygroscopic. This liquid is most likely to be

  1. A.CH3CH2CH2OH
  2. B.CH3CHOHCH3
  3. C.CH3CH2CHOHCH3
  4. D.CH2OHCHOHCH2OH
Show the answer and explanation

Answer: D (CH2OHCHOHCH2OH)

Explanation

Glycerol (propane-1,2,3-triol) has three –OH groups, giving strong hydrogen bonding. That makes it viscous, high-boiling, hygroscopic and fully miscible with water.