Question

pls explain +ve electromeric effect and -ve electromeric effect . with example!

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Answer 1

Electromeric effect:

Electromeric effect is a temporary effect and observed only in organic compounds with multiple bonds in the presence of an attacking reagent.

Electromeric effect can be defined as the complete transfer of shared pair of pi electrons of multiple bonds to one of the atoms in presence of an attacking reagent.

+E effect: In the positive electromeric effect the pi electrons of the multiple bond are transferred to that atom to which the attacking reagent is bonded.

-E effect: When the pi electrons of the multiple bond are transferred to the atom to which the attacking reagent does not get attached is called the negative electromeric effect.

For example in R2 --C==O when an electrophile is added, it forms R2--C(+)==O(-).

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Answer 2

Electromeric effect is a temporary effect and observed only in organic compounds with multiple bonds in the presence of an attacking reagent. ... +E effect: In the positive electromeric effect the pi electrons of the multiple bond are transferred to that atom to which the attacking reagent is bonded.

negative electromeric

effect: When the pi electrons of the multiple bond are transferred to the atom to which the attacking reagent does not get attached is called the negative electromeric effect.

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example:If the attacking species is an electrophile, the π electrons are transferred towards the positively charged atom. This is the +E effect. An example is the protonation of ethene. When the H⁺ comes near the double bond, the bond is polarized towards the proton