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Which of the following pairs represents ...

Which of the following pairs represents resonating structures ?

A

`H_(3)C - underset( O) underset( P) (C ) -CH_(3)` and `CH_(2) = underset( OH) underset(|)(C ) -CH_(3)`

B

`CH_(3)CN`and `CH_(3)NC`

C

`CH_(3)-C-=overset(+)(O)` and `H_(3)C -overset( +)(C ) =O `

D

`H_(2)C = CH-OH` and `overset(-)(C )H_(2) - CH = overset ( +)(O) H`

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