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A molecule has 3 reasonating structures ...

A molecule has 3 reasonating structures with energles `E _(1), E _(2) and E_(3)` in the order `E _(3) lt E _(2) lt E _(1).` The experimental energy of the moelcule is `E _(0).` Its resonance energy is

A

`(E _(1) + E _(2) + E _(3)) -E _(0)`

B

`E _(0) - E _(3)`

C

`E_(0) - E _(1)`

D

`E _(0) - E _(2)`

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