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What do we mean when we say its +M effect is greater than in its -I?
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.Examples of -M substituents:acetyl(IUPAC ethanoyl) -nitrile-nitroExamples of +M substituents:alcohol-amine-benzeneThanks & RegardsRinkoo GuptaAskIITians Faculty
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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