Which of the following is non-aromatic in nature?

Moderate

Solution

1)
$\Rightarrow 10 π - electrons \Rightarrow Aromatic \Rightarrow 4 n + 2 π - bond electron count$
2)
$\Rightarrow Cyclic \Rightarrow Conjugated \Rightarrow 8 π electrons \Rightarrow COT adopts a tub - like shape to escape anti aromaticity \Rightarrow Non - Planar \Rightarrow Not aromatic$
3)

$\Rightarrow 6 π-electrons \Rightarrow Aromatic \Rightarrow 4 n + 2 π - bond electron count$
4)
$\Rightarrow 6 π-electrons \Rightarrow Aromatic \Rightarrow 4 n + 2 π - bond electron count$

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