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The symmetric structure is the most stable, as it does not cause a strain of the condensed ring structure because of a longer length of a single bond, which would cause deviation from regular hexagons. See Bond Lengths in Naphthalene. It looks, comparing the measured versus predicted length of the central bond 1+1/3, the symmetric structure is little ...


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There is a very general and universal rule in chemistry: Memorize it, until you are able to see the behaviour patterns. There are 2 effects, affecting electron density: The induction effect $\text{I}$, affecting $\sigma$ bonds, is based on electronegativities on involved atoms. This is pretty straight forward and obvious. The mesomeric effect $\text{M}$, ...


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