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Resonance Effect

Energy of the...

Question

Energy of the resonance hybrid of nitrobenzene is $E_{0} k J / m o l$ and nitrobenzene has the following resonating structures with their energies given below:

Resonating structure Energy

$E_{1}$

$E_{2}$

$E_{3}$

$E_{4}$

$E_{5}$

The correct representation of the resonance energy would be:

E_{0} - E_{1} = E_{0} - E_{5} = R e s o n a n c e e n e r g y

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E_{0} - E_{3} = R e s o n a n c e e n e r g y

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E_{0} - E_{2} = E_{0} - E_{4} = R e s o n a n c e e n e r g y

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None of these

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Solution

The correct option is A $E_{0} - E_{1} = E_{0} - E_{5} = R e s o n a n c e e n e r g y$
Resonance energy = Energy of the resonance hybrid - Energy of the most stable resonating strucuture

These are most stable resonating structures having same energies $E_{1} = E_{5}$
Thus, the resonace energy will be $E_{0} - E_{1} = E_{0} - E_{5}$

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E_{0} k J / m o l

E_{0} k J / m o l

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Resonance hybrid is more stable than the resonating forms but the energy of the resonance hybrid is:

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