Which molecule contains a dative covalent (coordinate) bond?

A.     HCN

B.     \({{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\)

C.     \({\text{C}}{{\text{O}}_{\text{2}}}\)

D.     CO

D

One respondent suggested that this question should be deleted as the question is based on an incorrect interpretation. However, in the teachers note corresponding to AS 4.2.2 examples such as CO, \({\text{N}}{{\text{H}}_{{\text{4 + }}}}\) and \({{\text{H}}_{\text{3}}}{{\text{O}}^ + }\) are clearly mentioned.