Units of KC for  xAg⇌yBg  is lit2 mol-2, then the values of x and y cannot be

xAg⇌yBg,, units of Kc are mole/lit∆nGiven units of Kc are moles/lit-2;∴ ∆n=-2 ;Option (1) x = 1, y = 2 Δn = 1Option (2) x = 3, y = 2 Δn = -1Option (3) x = 2, y = 3 Δn = 1Thus none of the options match.Therefore 4th option is the correct option.