3 mole of reactant A and one mole of reactant B are mixed in a vessel of volume 1 litre. The reaction taking place is A+B⇌ 2C. If 1.5 mol of C is formed at equilibrium, the value of  Kc  is

A   +   B⇌2C          3          1           0                                     Given 2x=1.5          x         x          2x_                                                 x=0.75 (3−x)   (1−x)     2x                   Kc=1.5×1.52.25×0.25=10.25=4