A molecule or ion that donates the hydrogen in a hydrogen bond is a hydrogen bond donor

A molecule or ion that binds to this hydrogen is a hydrogen bond acceptor.

Specify the hydrogen bonding behavior of the $4$ species below by selecting:

donor for species that act as donors only

acceptor for species that act as acceptors only

both for species that act as both donors and acceptors

neither for species that act neither as donors nor as acceptors.

Hydrogen bonding behavior

Hydrogen bonding behavior

Hydrogen bonding behavior

Hydrogen bonding behavior