For the reaction : N₂(g) + 3H₂(g) ? 2NH₃(g)

Equilibrium constant K_c = $\frac{{\left[{\mathbf{N}\mathbf{H}}_3\mathbf{}\right]}^2}{\left[{\mathbf{N}}_2\mathbf{}\right]{\left[{\mathbf{H}}_3\mathbf{}\right]}^3\mathbf{ }}$

Some reactions are written below in Column I and their equilibrium constants in terms of K_c are written in Column II. Match the following reactions with the corresponding equilibrium constant.

Column I (Reaction)	Column II (Equilibrium constant)
(i) 2N2(g) + 6H2(g) ⇌ 4NH3(g)	(a) 2Kc
(ii) 2NH3(g) ⇌N2(g) + 3H2(g)	(b) Kc
(iii) N2(g) +  2H2(g) ⇌ NH3(g)	(c)
	(d) K2c