(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.

(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 $Resonance$.

Class 11 Chemistry 8-4.Organic Chemistry : Reaction mechanism Electronic Displacement in covalent bond

Easy

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.