An organic molecule has 5 C = C bonds (heat of hydrogenation for C = C bond is 28.8 kJ `mol^(-1)`) and experimental value for heat of hydrogenation is 99 kJ `mol^(-1)`. The resonance energy in kJ `mol^(-1)` is

Options

A. 45
B. 90
C. 70
D. 140

Answer

A

Explanation

Theoretical HOH = `5xx28.8=144.0` kJ/mol
`("Exp. HO = 99 kJ/mol")/("RE = 45 kJ/mol")` (Resonance energy = (`Delta` Hydrogenation) Theoretical - Exp.)