The enthalpy of hydrogenation of cyclohexene is `-119.5kJ mol^(-1)`. If resonance energy of benzene is `-150.4kJ mol^(-1)`, its enthalpy of hydrogenation would be `:`

Options

A. `-508.9 kJ mol^(-1)`
B. `-208.1 kJ mol^(-1)`
C. `-269.9 kJ mol^(-1)`
D. `-358.5 kJ mol^(-1)`

Answer

B

Explanation

Resonance energy = Observed `Delta H` - Calculated `Delta H=150.4=-358.5-(Delta H)_("calculated")`
`therefore (Delta H)_("calculated")=-208.1 kJ mol^(-1)`