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What do we mean when we say its +M effect is greater than in its -I?

What do we mean when we say its +M effect is greater than in its -I?

Grade:12

1 Answers

Rinkoo Gupta
askIITians Faculty 81 Points
9 years ago

Themesomeric effectorresonance effectinchemistryis a property ofsubstituentsorfunctional groupsin achemical compound. The effect is used in a qualitative way and describes the electron withdrawing or releasing properties of substituents based on relevantresonance structuresand is symbolized by the letterM. The mesomeric effect is negative (-M) when the substituent is an electron-withdrawing group and the effect is positive (+M) when based on resonance and the substituent is an electron releasing group.

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Rinkoo Gupta
AskIITians Faculty

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