The correct order of increasing hydration energy of the following conjugate bases of oxoacids of chlorine is

Options

A. `ClO^(-) lt ClO_(2)^(-) lt ClO_(3)^(-) lt ClO_(4)^(-)`
B. `ClO_(4)^(-) lt ClO_(3)^(-) lt ClO_(2)^(-) lt ClO^(-)`
C. `ClO_(4)^(-) lt ClO_(3)^(-) lt ClO^(-) lt ClO_(2)^(-)`
D. `ClO_(3)^(-) lt ClO_(4)^(-) lt ClO_(2)^(-) lt ClO^(-)`

Answer

A

Explanation

Smallest cation is heavily hydrated. `ClO_(4)^(-)` has smallest central atom as it has +7 charge on it followed by `ClO_(3)^(-)(+5),ClO_(2)^(-) (+3),ClO^(-)(+1)`. So, the order of hydration energy is `ClO_(4)^(-) gt ClO_(3)^(-) gt ClO_(2)^(-) gt ClO^(-)`