Question

Heat of hydrogenation of ethene is $X_1$ and that of benzene is $X_2$, hence resonance energy of benzene is $(X_1-X_2)$.

• A. True
• B. False

Answer 1

The correct option is B False

The given statement is false.
Heat of hydrogenation of ethene is $X_1$ and that of benzene is $X_2$, hence resonance energy of benzene is $(3X_1-X_2)$.
Note: $3X_1$ corresponds to the heat of hydrogenation of 3 unconjugated double bonds.
$X_2$ corresponds to the heat of hydrogenation of 3 conjugated double bonds.
The difference gives the resonance energy of benzene.