MCQ
The chemical system that is non-aromatic is
- A

- B

- ✓

- D






$[(4 n+2) \pi \text { electron }]$ system,
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$\mathrm{Sn}^{4+}, \mathrm{Sn}^{2+}, \mathrm{Pb}^{2+}, \mathrm{Tl}^{3+}, \mathrm{Pb}^{4+}, \mathrm{Tl}^{+}$