Question

In which case hydrogen bond will not be observed
(a) $H_3O_2^-$
(b) H₂O
(c) $H_5O_2^+$
(d) H₃O⁺

Answer 1

When oxygen atom is protonated, i.e. electronegativity decreases, chances of forming hydrogen bond also decreases.
 
Thus in H3O+, hydrogen bonding is less.