The following effect is known as . . . . . .

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(B) The Electromeric effect is a temporary effect in which a shared pair of $\pi$ electrons is completely transferred from a double or a triple bond t

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Electromeric effect

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(B) The Electromeric effect is a temporary effect in which a shared pair of $\pi$ electrons is completely transferred from a double or a triple bond to one of the atoms joined by the bond at the requirement of an attacking species.It is represented by the symbol $E$.It is said to be $+E$ when the displacement of $\pi$ electrons is away from the atom or group,and $-E$ when the displacement of $\pi$ electrons is towards the atom or group.In the given image,the complete transfer of the $\pi$ bond occurs due to the presence of an attacking reagent ($H^+$ or $CN^-$),which is the characteristic feature of the Electromeric effect.Hence,the correct option is $B$.

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