Hi in Huckels rule in trying to figure out aromatic vs. anti etc whats the n stand for? and does the pi electrons count one per double bond or 2 for each double bond? thanks
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The n here is any integer, meaning that a cyclic, conjugated compound with 2, 6, 10, 14, 18... electrons will be considered aromatic. Any other number (1, 3, 4, 5, 7, 8, 9...) will not be an aromatic compound.
In looking at double-bonds, each one has two pi electrons (since there have to be two electrons involved in the sigma bond, and two in the pi bond).
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