I was studying Huckel Rule. And I stuck on one of the point.(adsbygoogle = window.adsbygoogle || []).push({});

(iv) The total number of pi electrons in the molecular species or ion should be 4n + 2 where n = 0, 1, 2, ................... etc.

But I don't know how to calculate the number of pi electron. Do you have any idea about it.

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# Number of pi electon

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