Compound which shows positive mesomeric ...

Compound which shows positive mesomeric effect

A

`CH_(2) = CH - Cl`

B

`C_(6)H_(5)-N^(+)-Me_(3)`

C

`CH_(2)=CH-CH_(2)Cl`

D

`C_(6)H_(5) - CH = CHCl`

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The correct Answer is:

A, D

The groups which donate electrons to the double bond or to a conjugated system are said to have `+M` effect or +R effect, e.g.

This criteria is fulfilled by options (a) and (d) only.

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