Which of the following molecules is not aroma | vedclass

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(D) An aromatic species must be planar,cyclic,fully conjugated,and possess $(4n+2) \pi$ electrons,where $n$ is an integer.$A$. Cyclopentadienyl anion:

Vedclass · Accepted Answer

Cycloheptatriene

Vedclass · Answer

(D) An aromatic species must be planar,cyclic,fully conjugated,and possess $(4n+2) \pi$ electrons,where $n$ is an integer.$A$. Cyclopentadienyl anion: It is cyclic,planar,fully conjugated,and has $6 \pi$ electrons $(n=1)$,so it is aromatic.$B$. Tropylium cation: It is cyclic,planar,fully conjugated,and has $6 \pi$ electrons $(n=1)$,so it is aromatic.$C$. Cyclopropenyl cation: It is cyclic,planar,fully conjugated,and has $2 \pi$ electrons $(n=0)$,so it is aromatic.$D$. Cycloheptatriene: It has a $sp^3$-hybridized carbon atom in the ring,which breaks the continuous conjugation of the $\pi$ system. Therefore,it is not aromatic.

Which of the following molecules is not aromatic?

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