The document discusses the electromeric effect, which is a temporary effect observed in organic compounds containing multiple bonds. It involves the movement of a shared pair of pi-electrons between atoms when attacked by a reagent. The atom receiving the electrons becomes negatively charged while the other becomes positively charged. When the reagent is removed, the compound returns to its original state. The document also explains positive electromeric effect occurs when an electrophile attacks and electrons shift toward the positively charged atom, while negative electromeric effect involves electrons shifting away from a nucleophilic attack.

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2.  Electromeric Effect is a temporary effect.
 It is observed only in those organic compounds which having multiple
bonds (double bond or triple bond).
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3.  It is the movement of shared pair of pi-electrons from one atom to other
atom, when it is attacked by reagent.
 The atom to which the electron is completely transferred becomes
negatively charged and the other atom becomes positively charged.
 As the reagent is removed, then the compound comes into its original state.
Here, B is more electronegative than
A
A B A+ B-
Electrophilic Reagent
Reagent Removal
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4. Positive electromeric effect –
If the attacking species is an electrophile, then pi- electrons are transferred
towards the positively charged atom.
All the alkyl groups have positive electromeric effect.
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5. Negative electromeric effect –
If the attacking species is an nucleophile, then pi- electrons are transferred
away from attacking reagent.
All the unsaturated groups have negative electromeric effect.
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