What is the difference between the mesomeric effect and the resonance effect?

  • A
    The mesomeric effect involves $\pi$-electrons,while the resonance effect involves $\sigma$-electrons.
  • B
    The mesomeric effect is a permanent effect,while the resonance effect is a temporary effect.
  • C
    There is no fundamental difference between them; they are often used interchangeably to describe the delocalization of $\pi$-electrons.
  • D
    The mesomeric effect only occurs in cyclic compounds,while the resonance effect occurs in all compounds.

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