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Which of the following molecules, in pur...

Which of the following molecules, in pure form, is /are ustable at room temperature?

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
B, C

Both (b) and (c ) are planar molecules and contain cyclic clouds of `4pi`-electrons and hence are antiaromatic. Therefore these are unstable at room temperature. Compound under option (a) also contions `4pi`-electrons but these are not delocalized over the entire ring. Therefore, it is non-aromatic. Compound under option (d) contains completely delocatlized `6pi`-electrons and is also planar. Therefore, it is aromatic.
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