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Q.

An organic molecules has 5 (C = C) bonds (heat of hydrgenation 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

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a

90

b

140

c

45

d

70

answer is A.

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Detailed Solution

Theoretical ∆ Hydrogentaion for 5(C - C) bond = 5 × 28.8 = 1440.0 kJ/mol

Exp. ∆ Hydrogenation = 99

RE = 144 - 99 = 45 kJ mol-1

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