Which contains both polar and non-polar bonds ? .

Options

A. `H_2O_2`
B. `CH_4`
C. `HCN`
D. `NH_4Cl`

Answer

A

Explanation

Such bonds are present in polar covalent compounds only. `NH_4Cl` is ionic, `CH_4` is covalent, but all the bonds between C and H are polar due to electronegativity difference. The Lewis structure of `HCN` is `H-C-=N:`, it also has only polar bonds. In `H_2O_2`, having the Lewis structure
`H-overset(..)underset(..)O-underset(..)overset(..)O-H`
the bond between like O atoms is nonpolar while the bond between unlike H and O atoms is polar.