Question

Which of the following species can form hydrogen bond with water
a) CH₄
b) HCOOH
c) Na⁺
d) C₆H₆

Answer 1

b) HCOOH

Hydrogen bonding is a force between hydrogen attached to an electronegative atom of one molecule and an electronegative atom of different molecule. It is limited to electronegative atoms N, O and F (sometimes Cl also).

On this basis, among the given species, only HCOOH can form hydrogen bond with water.