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प्रश्न
Explain why the following system is not aromatic?

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उत्तर

For the given compound, the number of π-electrons is four.
By Huckel’s rule,
4n + 2 = 4
4n = 2
n = 1/2
For a compound to be aromatic, the value of n must be an integer (n = 0, 1, 2…), which is not true for the given compound. Hence, it is not aromatic in nature.
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| (i) | ![]() |
| (ii) | ![]() |
| (iii) | ![]() |
| (iv) | ![]() |
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| (B) | ![]() |
| (C) | ![]() |
| (D) | ![]() |
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