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Introduction to Alkenes

The enthalpy ...

Question

The enthalpy of hydrogenation for $1 - p e n t e n e$ is $+ 126 k J / m o l$ . The enthalpy of hydrogenation for $1, 3 - p e n t a d i e n e$ is $+ 230 k J / m o l$ . Hence estimate the resonance magnitude of (delocalization) energy of $1, 3 - p e n t a d i e n e$ .

A

22 k J / m o l

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B

104 k J / m o l

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C

252 k J / m o l

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D

cannot be calculated from this information

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Solution

The correct option is D $22 k J / m o l$
Enthalpy of hydrogenation per bond $= + 126 k J / m o l$

Enthalpy of hydrogenation for 2 bonds $= + 252 k J / m o l$

Resonance energy $= 252 - 230 = 22 k J / m o l$

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