Question

explain electromeric effect

Answer 1

$\mathbb{ELECTROMERIC\: EFFECT : (E-effect) }$

The electromeric effect is a temporary effect shown by organic compounds containing multiple bonds .
the complete transfer or shift of π electron pair of a multiple Bond to one of the bonded atom during the attack of positively or negatively charged Reagent is called as electromeric effect or(E- effect ).

This temporary effect takes place only in presence of attacking reagent as soon as the reagent is removed the molecule reverts back to the original position depending upon the direction of displacement .

1) -E effect:
An attacking reagent is said to have -E effect when the direction of π electron pair transfer of multiple bond is away from the attacking reagent.
=> The -E effect operates during the nucleophilic addition reaction of aldehydes and ketones

2) +E effect:
An attacking reagent is said to have +E effect when the direction of π electron pair transfer of a multiple bond is towards the attacking reagent
=> The +E effect is observed during electrophilic addition reaction of alkenes and alkynes

Answer 2

☺️${\huge {\overbrace {\underbrace {\purple { ANSWER }}}}}$☺️

Explanation:

$\red{\text{Electromeric effect}}$

➡The displacement of the valance electron resulting in polarization of an organic molecule is called electromeric effect.

➡ It is possible only in π bond

➡ It is temporary effect.

➡It needs the presence of electrophillic reagent.

➡This arises due to mobility of electrons in doublebond.

➡For eg. In presence of bromine the π bond in the ethene molecule undergoes to give di- ionic structure.

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