JEE Advanced 2014 Chemistry question

Hydrogen bonding plays a central role in the following phenomena:

(A)Ice floats in water.Correct
(B)Higher Lewis basicity of primary amines than tertiary amines in aqueous solutions.Correct
(C)Formic acid is more acidic than acetic acid.
(D)Dimerisation of acetic acid in benzene.Correct

Answer: (A),(B),(D)

Solution

(A) In ice each water molecule is hydrogen-bonded tetrahedrally to four others, giving an open cage structure less dense than liquid water, so ice floats. (B) In water the protonated primary amine (three N–H bonds) is much better stabilised by hydrogen bonding with water than (one

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Question ID VK-026268