The following effect is known as___

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Electromeric effect is a temporary effect in which a shared pair of electrons ( π -electron pair) is completely transferred from a double or a triple bond to one of the atoms joined by the bond at the requirement of attacking species. The Electromeric effect is represented by symbol E , and is said to be +   E when the displacement of π electrons is away from the atom or group, and -   E when displacement of π electrons are towards the atom or group. If the multiple bond is present between