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

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