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Question

Hydrogen bonding plays a central role in which of the following phenomena?
  1. Ice floats in water
  2. Higher Lewis basicity of primary amines than tertiary amines in aqueous solutions.
  3. Formic acid is more acidic than acetic acid
  4. Dimerization of acetic acid in benzene


Solution

The correct options are
A Ice floats in water
B Higher Lewis basicity of primary amines than tertiary amines in aqueous solutions.
D Dimerization of acetic acid in benzene
Take the instance of HCl. HCl does not form hydrogen bond. For formation of hydrogen bond, at least one hydrogen atom must be bonded to one of the three most electronegative atom O, N and F.

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