The carbon monoxide molecule is correctly represented by a triple covalent bond between the carbon and oxygen atoms. One of the bonds is a coordinate covalent bond , a covalent bond in which one of the atoms contributes both of the electrons in the shared pair.

Which one has a coordinate bond?

Hence, the compound which contains covalent coordinate bonds is ammonium ion. Thus, option (C) is the correct answer.

Which compound contains a coordinate bond?

Carbon monoxide, CO, can be thought of as having two ordinary covalent bonds between the carbon and the oxygen plus a coordinate bond using a lone pair on the oxygen atom.