ELECTROMERIC EFFECT 

It is like mesomeric effect, it also involves the π electrons. The electromeric effect refers to the polarity produced in a multiple bonded compound as it is approached by a reagent when a double or triple bond is exposed to an attack by an electrophile E+ the two electrons which form a π bond are completely transferred to the atom or the other.

The mesomeric effect is represented as..........

The curved arrow shows the displacement of the electron pair, the atom A has lost it's share in the electron pair and B has gained this share as a result A acquires a positive charge and B acquires a negative charge. Notice that the arrow points away from the centre of the bond and towards the atom that gains the electron pair. the electromeric effect is a temporary effect it takes place only in the presence of a reagent. 

Puvvukonvict..............