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The number of pi bond in o-xylene is

The number of pi bond in o-xylene is

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A)
All hexagons have six sides, contributing 6 σ bonds.

Each C−H bond on the benzene ring adds one σ bond, for a total of 4.

The C−C bond with each methyl group counts as one σ bond, contributing a total of 2 σ bonds.

The three C−H bonds on each methyl group contribute a total of 6 more σbonds.

So, we have a total of 18 σ bonds.

Inside the benzene ring, you have delocalized π electrons over six atoms. The major resonance structure has three π bonds; one for each double bond.

So the result is 18 σ and 3 π bonds.
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