Question

When comparing the hydrogenation of benzene with that of a hypothetical $1,3,5$-cyclohexatriene, benzene ____________ than the cyclohexatriene.

• A. Absorbs $152$ kJ/mol more heat
• B. Gives off $152$ kJ/mol more heat
• C. Absorbs $152$ kJ/mol less heat
• D. Gives off $152$ kJ/mol less heat

Answer 1

The correct option is A Absorbs $152$ kJ/mol more heat

Hydrogenation of benzene has $208KJ/mol$ of energy.

Whereas,hydrogenation of $1,3,5$ cyclo hexatriene has $360KJ/mol$ of energy.

The difference of $152KJ/mol$ is termed as resonance energy.