1.

Hydrogen bonding plays a central role in the following phenomena:

Answer»

ICE floats in water
Higher Lewis basicitiy of primary amines than tertiary amines in aqueous solutions
forminc acid is more acidic than acetic acid
Dimerisation of acetic acid in benzene

Solution :Due to CAGE like structure in which each water molecule is SURROUNDED by four other water molecules tetrahedrally through H-bonding, there are a number of vacant spaces I the crystal lattice of ice. As a result, ice has lower density than water and hence floats in water.
(b) Due to greater H-bonding, the ammonium cation derived from `1^(@)` amine is mroe stable than that derived from `3^(@)` amine. (c) Due to absence of +I-effect of the `CH_(3)` group, HCOOH is a stronger acid than `CH_(3)COOH` and not due to H-bonding. thus. option (c) is wrong.
(d) Acetic aacid dimerises in benzene due to H-bonding.


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