Why does `H^(+)` ion always get associated with atoms or molecules ?

Options

A. Ionisation enthalpy of hydrogen resembles that of alkali metals
B. Its reactivity is similar to halogens
C. It resembles both alkali metals and halogens
D. Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to small size, it cannot exist free

Answer

D

Explanation

`H^(+)` ion always get associated with other atoms or molecules. The reason is that loss of an electron from hydrogen atoms results in a nucleus of very small size as compared to other atoms or ions. Due to small size, it cannot exist free.