Hydrogen bonding plays a central role in the following phenomena .

Options

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

Answer

A, B, D

Explanation

a.Ice has cage-like structure in which each water molecule is surrounded by four water molecules tetrahedrally through hydrogen bonding, due to this density of ice is than water and its floats in water
b. The cation `(I)` is more stablized through hydrogen bonding than cation `(II)`. So,`R-NH_(2)` is better base than `(R)_(3)N` in aqueous solution.


`HCOOH` is stronger acid than `CJ_(3)COOH` due to inductive effect and not due to hydrogen bonding.
effect of `CH_(3)` group intensifies negative charge on acetate ion and make that ion unstable.
d.Acetic acid dimerzies in benzene through intermolecular hydrogen bonding.