Question

why electomeric effect is called as temporary effect? define +ve and -ve electomeric effect!


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Answer 1

Electromeric effect is a temporary effect and observed only in organic compounds with multiple bonds in the presence of an attacking reagent. ... -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.
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Answer 2

Electromeric effect is called temporary because it is only observed in presence of attacking reagents.

The molecule reverts back to its original state.

+ve electromeric effect means that I electrons migrate to attacking reagent from the π system . Reagent must be an electrophile. For example - H+.

-ve electromeric effect means that I electrons migrate from attacking reagent to the π system . Reagent must be a nucleophile. For example - CN.

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