Heat of hydrogenation of cyclohexene (g) is – 29 kcal $mo{l}^{–1}$, observed heat of hydrogenation of cyclohexa-1, 3-diene (g) is – 56 kcal $mo{l}^{–1}$ and resonance energy of benzene (g) is –36 kcal/mol. 

The observed heat of hydrogenation of benzene (g) is -51 kcal $mo{l}^{–1}$

The magnitude of resonance energy of cyclohexa-1, 3-diene (g) is 2 kcal $mo{l}^{–1}$

The observed heat of hydrogenation of benzene (g) is –123 kcal $mo{l}^{–1}$

The theoretical heat of hydrogenation of benzene (g) is –87 kcal $mo{l}^{–1}$