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 holgens
D. Loss of an electron form hydrogen atom results in a nucleus of very small sizes 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 atom results in a nucles of very small size as compared to other atoms or ions. Due to small size it cannot exist free.