Which of the following compounds exhibits a p | vedclass

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(A) group exhibits a positive mesomeric effect ($+M$ effect) if it donates electron density to the conjugated system through resonance.In $CH_2 = CH -

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$CH_2 = CH - Cl$

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(A) group exhibits a positive mesomeric effect ($+M$ effect) if it donates electron density to the conjugated system through resonance.In $CH_2 = CH - Cl$,the chlorine atom has lone pairs of electrons that can be donated to the conjugated system via resonance,thus showing a $+M$ effect.Other options like $-N(CH_3)_3^+$ and $-CHO$ are electron-withdrawing groups and exhibit a negative mesomeric effect ($-M$ effect).$CH_2 = CH - CH_2Cl$ does not show a mesomeric effect as there is no conjugation between the $Cl$ atom and the double bond.

Which of the following compounds exhibits a positive mesomeric effect ($+M$ effect)?

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