Question

How can identify positive and negative mesomeric effect?

Answer 1

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The mesomeric effect is negative (–M) when the substituent is an electron-withdrawing group and the effect is positive (+M) ...

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Answer 2

Answer:

The mesomeric effect in chemistry is a property of substituents or functional groups in a chemical compound. ... The mesomeric effect is negative (–M) when the substituent is an electron-withdrawing group and the effect is positive (+M) when the substituent is an electron donating group.