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Question

The enthalpy of hydrogenation for 1−pentene is +126 kJ/mol. The enthalpy of hydrogenation for 1,3−pentadiene is +230 kJ/mol. Hence estimate the resonance magnitude of (delocalization) energy of 1,3−pentadiene.

A
22kJ/mol
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B
104kJ/mol
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C
252kJ/mol
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D
cannot be calculated from this information
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Solution

The correct option is D 22kJ/mol
Enthalpy of hydrogenation per bond=+126 kJ/mol

Enthalpy of hydrogenation for 2 bonds=+252 kJ/mol

Resonance energy=252230=22 kJ/mol

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