A dative bond is present in the molecule of

A dative bond is also called coordinate covalent bond. It is a kind of chemical bond in which one atom furnishes a shared pair of electrons for the building of a bond.Other atom does not furnish electrons for sharing. The building of the coordinate covalent bond belongs to the atoms that carry lone pairs of electrons.
 

$$\begin{gathered} 1) \mathrm{H}-\ddot{\mathrm{N}}-\mathrm{H} \\ | \\ \mathrm{H} \\ 2) \mathrm{O}=\mathrm{C}=\mathrm{O} \\ 3) :\mathrm{C}\equiv \dot{\mathrm{O}} : \to CO \mathrm{has} \mathrm{dative} \mathrm{bond} \end{gathered}$$