What is the difference between the mesomeric | vedclass

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(C) The terms $Mesomeric \ effect$ and $Resonance \ effect$ are often used interchangeably in organic chemistry. Both refer to the delocalization of $

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There is no fundamental difference between them; they are often used interchangeably to describe the delocalization of $\pi$-electrons.

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(C) The terms $Mesomeric \ effect$ and $Resonance \ effect$ are often used interchangeably in organic chemistry. Both refer to the delocalization of $\pi$-electrons or lone pairs of electrons through a conjugated system. While some textbooks distinguish them by stating that the $Mesomeric \ effect$ is specifically used for substituents attached to a conjugated system (like $-OH, -NH_2$),the underlying electronic mechanism is identical to $Resonance$.

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

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