A certain amount of ideal gas is expanded from volume V1 to volume V2 .Then the work done by the gas is least when the process of expansion is

Work done by the gas = Area under P-V diagram Now for the process PVn=CWhen n = 0 process is isobaric ……(1)When n = 1 process is isothermal ……(2)When γ>n>1 process is polytropic ……(3)When n=γ process is adiabatic ……(4)