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NEET levelSingle correct optionDifficulty 1 of 3g1066

Which statement about the mesomeric effect is correct?

  1. AIt requires only sp3 hybridised atoms
  2. BIt decreases with distance along a saturated carbon chain like the inductive effect
  3. CIt requires a pi bond or lone pair in conjugation and operates through pi electrons
  4. DIt operates only through sigma bonds

Answer: C

The mesomeric (resonance) effect is the permanent polarisation of pi electrons or lone pairs through a conjugated system. It does not operate through sigma bonds, which is the domain of the inductive effect.
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