Duduli

In case of compounds having a double or triple bond, the pair of π-electrons gets completely transferred to the more electronegative element under the influence of an attacking reagent. For example, when CN - attacks the carbon of the carbonyl group, electron pair of the z-bond gets completely transferred to the oxygen atom as shown below :

Answer:- In case of compounds having a double or triple bond, the pair of π-electrons gets completely transferred to the more electronegative element under the influence of an attacking reagent.I.e complete transfer of a shared pair of electrons of a multiple bond to one of the bonded atoms under the influence  of the attacking reagent is known as the electromeric effect.