JEE Advance - Chemistry (2014 - Paper 1 Offline - No. 11)

Hydrogen bonding plays a central role in the following phenomena

ice floats in water

higher Lewis basicity of primary amines than tertiary amines in aqueous solutions

formic acid is more acidic than acetic acid

dimerisation of acetic acid in benzene

Explanation

(a) Ice floats in water due to the low density of ice as compare to water which is due to open cage like structure (formed by intermolecular H-bonding).

(b) Basic strength of RNH₂ > R₃N. It is also explained by hydrogen bonding.
JEE Advanced 2014 Paper 1 Offline Chemistry - Chemical Bonding & Molecular Structure Question 9 English Explanation 1

(c)

JEE Advanced 2014 Paper 1 Offline Chemistry - Chemical Bonding & Molecular Structure Question 9 English Explanation 2

(d) Dimerisation of acetic acid in benzene is due to intermolecular hydrogen bonding.
JEE Advanced 2014 Paper 1 Offline Chemistry - Chemical Bonding & Molecular Structure Question 9 English Explanation 3

JEE Advanced 2014 Paper 1 Offline Chemistry - Chemical Bonding & Molecular Structure Question 9 English Explanation 3

JEE Advance - Chemistry (2014 - Paper 1 Offline - No. 11)

Explanation

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