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(C) The $C-Cl$ bond length is shortest in $CH_2=CH-Cl$ (vinyl chloride).In $CH_2=CH-Cl$,the lone pair of electrons on the chlorine atom is in conjugat

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$CH_2=CH-Cl$

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(C) The $C-Cl$ bond length is shortest in $CH_2=CH-Cl$ (vinyl chloride).In $CH_2=CH-Cl$,the lone pair of electrons on the chlorine atom is in conjugation with the $\pi$-electrons of the double bond.This leads to resonance,which gives the $C-Cl$ bond a partial double bond character.Due to this partial double bond character,the bond length decreases compared to a pure single $C-Cl$ bond found in the other options.

Among the following compounds,which one has the shortest $C-Cl$ bond?

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