Given, for isochoric process dE=0 that is wrong because for isochoric process dv=0. For an isothermal process temperature remins constant, therefore, dT=0 for an isobaric process pressure remains constant, therefore, dp=0. For an adiabatic process, there is no exchange of heat between system and the surroundings, therefore, dQ=0 Hence, option (c) is not true.