Which one of the following is most acidic?

Options

A. `H_(2)O`
B. `H_(2)S`
C. `H_(2)Te`
D. `H_(2)Se`

Answer

C

Explanation

Acidic nature`prop`Bond dissociation energy.
Bond dissociation energy decreases down the group with increase in the H-A bond length. Order of bond dissociation energies is, `H_(2)O gt H_(2) S gt H_(2)Se gt H_(2)Te`.
`thereforeH_(2)Te` is most acidic among the given compounds because is readily gives proton due to its low bond dissociation energy and high bond length.