A) Cyclopentadienyl anion
B) Cycloheptatrienyl cation
C) Cyclooctatetraene
D) Thiophene
Correct Answer: C
Solution :
Cyclooctatetraene is not aromatic in nature. In cyclooctatetraene, delocalisation of\[\pi -\]electrons takes place but HuckeFs rule is not followed. According to HuckeFs rule, it should contains\[10\pi (4n+2)\] electrons but it contains only \[8\pi \] electrons. \[\pi \]electron \[(8)\ne (4n+2)=10\] (i.e., Huckel rule is not followed), hence it is not aromatic.You need to login to perform this action.
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