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Electromeric Effect Notes | Study Additional Documents and Tests for JEE - JEE

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Electromeric Effect

It involves the complete transfer of electrons of a multiple bond to one of the bonded atom in presence of an electron attacking reagent. It is called the E effect.

Electromeric Effect Notes | Study Additional Documents and Tests for JEE - JEE
This effect is temporary and takes place only in the presence of a reagent. As soon as the reagent is removed, the molecule reverts back to its original position.

Electromeric effect is of two types:

+E effect: If the electrons of the π-bond are transferred to that atom of the double bond to which the reagent gets finally attached, the effect is called +E effect.

For Ex: Addition of acids to alkenes

Electromeric Effect Notes | Study Additional Documents and Tests for JEE - JEE
-E Effect : If the electrons of the double bond are transferred to an atom of the double bonds other than the one to which the reagent gets finally attached the effect is called -E Effect.

For Ex: Addition of Cyanide ion to the carbonyl group.

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