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Calculate the double bond equivalent of ...

Calculate the double bond equivalent of benzens from its molecular formula.

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Double bond equivalent (DBE) of a compound,
`DBE=(sumn(v-2))/2+1`
where ,n is the number of different atoms present in the molecule and v is the valency of each atom. Molecular formula of benzene is `C_6H_6`.
So, DBE of benzene =`(6(4-2)+6(1-2))/2+1=4`
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