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The enthalpy of combustion of cyclohexane, cyclohexene and H2 are respectively -3920, -3800 and -241 kJ mol-1. The heat of hydrogenation of cyclohexene is
(1) -121 kJ mol-1 (2) 121 kJ mol-1
(3) -242 kJ mol-1 (4) 242 kJ mol-1