When cyclohexene is hydrogenated, the heat evolved is 120 kJ mol. But when benzene is hydrogenated t

Question

When cyclohexene is hydrogenated, the heat evolved is 120 kJ mol. But when benzene is hydrogenated the heat evolved is 210 kJ $\mathrm{mol}^{-1}$.The difference between expected value and actual value is $120 	imes 3-210=150 \mathrm{~kJ} \mathrm{~mol}^{-1}$. This difference is $\qquad$\

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