(B) $NCl_3$ does not have vacant $d$-orbitals,so it cannot expand its octet to accommodate the incoming water molecule for hydrolysis to form an oxyac

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(B) $NCl_3$ does not have vacant $d$-orbitals,so it cannot expand its octet to accommodate the incoming water molecule for hydrolysis to form an oxyacid of nitrogen. Instead,it undergoes hydrolysis to form $NH_3$ and $HOCl$ (hypochlorous acid),where $Cl$ is the central atom of the oxyacid formed.