Mesomeric Effect (+M): How Phenol Releases Electrons

The video tutorial explains the mesomeric effect, a phenomenon where atoms or groups of atoms establish or extend resonance by releasing or withdrawing electrons. It introduces M groups and classifies the mesomeric effect into plus M and minus M effects. The plus M effect is detailed with examples in phenols and vinyl chloride, highlighting how lone electron pairs participate in resonance, increasing electron density and reactivity. The tutorial emphasizes the role of plus M groups in stabilizing molecules and enhancing reactivity in electrophilic aromatic substitution.

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