The displacement of electrons in a multiple bond in the presence of attacking reagent iscalled

The displacement of electrons in a multiple bond in the presence of an attacking reagent is called "Electrophilic Addition".

Here's a step-by-step explanation:

1. Electrophilic addition is the reaction between an electrophile and a nucleophile. In this case, the electrophile is the attacking reagent and the nucleophile is the electron-rich multiple bond.

2. The electrophile is attracted to the electron-rich region of the multiple bond. This causes the electrons in the bond to be displaced towards the electrophile.

3. The electrophile accepts a pair of electrons from the multiple bond, forming a new bond. This results in the breaking of the multiple bond and the formation of two new single bonds.

4. The product of this reaction is a compound with the electrophile added to the original molecule.

This process is a common mechanism in organic chemistry, particularly in reactions involving alkenes and alkynes.