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:-

Question

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:- (A) -508.9 KJ mol-1 (B) -2.8.1 Kj mol-1 (C) -269.9 KJ mol-1 (D) -358.5 Kj mol-1

Tardigrade Admin · Accepted Answer

∵ Heat of hydrogenation of cyclohaxene =-119.5 kJ / mol ∴ Heat of hydrogenation of benzene =3 ×-119.5=-358.5 KJ / mol Resonance energy = Observed Δ H - Calculated Δ H -150.4=-358.5- x x =-208.1 KJ

Q. The enthalpy of hydrogenation of cyclohexene is $- 119.5 k J m o l^{- 1} .$ If resonance energy of benzene is $- 150.4 k J m o l^{- 1}$ , its enthalpy of hydrogenation would be:-

$- 508.9 K J m o l^{- 1}$

$- 2.8.1 K j m o l^{- 1}$

$- 269.9 K J m o l^{- 1}$

$- 358.5 K j m o l^{- 1}$

$∵$ Heat of hydrogenation of cyclohaxene

$= - 119.5 k J / m o l$

$∴$ Heat of hydrogenation of benzene

$= 3 \times - 119.5 = - 358.5 K J / m o l$

Resonance energy

$=$ Observed $Δ H -$ Calculated $Δ H$

$- 150.4 = - 358.5 - x$

$x = - 208.1 K J$

Q. The enthalpy of hydrogenation of cyclohexene is −119.5kJmol−1. If resonance energy of benzene is −150.4kJmol−1, its enthalpy of hydrogenation would be:-

−508.9KJmol−1

−2.8.1Kjmol−1

−269.9KJmol−1

−358.5Kjmol−1