c
Water is a chemical element having the symbol \(H _2 O\). The bond angle of water is equal to \(104.5^{\circ}\) and it does not have the largest bond angle. Hence, option \((A)\) is incorrect.

Oxygen difluoride is a chemical element having the symbol \(F_2 O\). The bond angle of water is equal to \(102^{\circ}\) and it does not have the largest bond angle. Hence, option \((B)\) is incorrect.

Among the given compounds, the \(Cl _2 O\) has the largest bond angle and which is equal to \(109.5^{\circ}\). The largest bond angle of chlorine monoxide is because of the presence of large lone pair - bond pair repulsion. And it will increase the bond angle of chlorine monoxide. And this type of repulsion also depends upon the electronegativity. Hence, option \((C)\) is correct.

Hydrogen sulphide is a chemical element having the symbol \(H _2 S\). The bond angle of water is equal to \(90^{\circ}\) and it does not have the largest bond angle. Hence, option \((D)\) is incorrect.