The enthalpy of hydrogenation of cyclohexene | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The enthalpy of hydrogenation of cyclohexene is $-119.5 \ kJ \ mol^{-1},$ which corresponds to the hydrogenation of one $C=C$ double bond.Benzene

Vedclass · Accepted Answer

$-508.9$

Vedclass · Answer

(B) The enthalpy of hydrogenation of cyclohexene is $-119.5 \ kJ \ mol^{-1},$ which corresponds to the hydrogenation of one $C=C$ double bond.Benzene contains three $C=C$ double bonds. Therefore,the calculated enthalpy of hydrogenation for benzene (assuming no resonance) is:$\Delta H_{Cal} = 3 	imes (-119.5 \ kJ \ mol^{-1}) = -358.5 \ kJ \ mol^{-1}.$Resonance energy is defined as the difference between the experimental enthalpy of hydrogenation and the calculated enthalpy of hydrogenation:$	ext{Resonance Energy} = \Delta H_{Exp} - \Delta H_{Cal}.$Given that the resonance energy is $-150.4 \ kJ \ mol^{-1},$ we have:$-150.4 = \Delta H_{Exp} - (-358.5).$Solving for $\Delta H_{Exp}:$$\Delta H_{Exp} = -150.4 - 358.5 = -508.9 \ kJ \ mol^{-1}.$

The enthalpy of hydrogenation of cyclohexene is $-119.5 \ kJ \ mol^{-1}.$ If resonance energy of benzene is $-150.4 \ kJ \ mol^{-1},$ its enthalpy of hydrogenation would be $...... \ kJ \ mol^{-1}.$

Similar Questions

Acylation process is preferred over direct alkylation in the Friedel-Crafts reaction because:

Which of the following statements is incorrect for the nitration of an aromatic compound?

Which of the following compounds will undergo electrophilic substitution more readily than benzene?

Among the following,the set which represents aromatic species is:

Amongst the following,the compound that can be most readily sulphonated is

Vedclass Test Series

Exam Paper Generator

Online Exam Module