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Among the following the least stable res...

Among the following the least stable resonance structure is : , , ,

A

B

C

D

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Verified by Experts

The correct Answer is:
A
Two positive charges present at the adjacent place, elevates the energy, thus lowers the stability most.
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BRILLIANT PUBLICATION-ORGANIC CHEMISTRY : SOME BASIC PRINCIPLES - PART II (ISOMERISM AND REACTION MECHANISM) -LEVEL-II (ASSERTION-REASON TYPE)
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