Electrophiles:

Electron-deficient molecules are termed as electrophiles (electron-loving) and react along with nucleophiles. Positively charged ions can simply be recognized as electrophiles (for example a carbocation), but neutral molecules can also work as electrophiles if they comprise specific kinds of functional groups (for example carbonyl groups or alkyl halides).

Electrophilic center:

Electrophiles have a particular atom or region of the molecule that is electron deficient. This region is termed as the electrophilic center. In a positively charged ion, the electrophilic center is the atom that is bearing the positive charge (for example the carbon atom of a carbocation). In a neutral molecule, the electrophilic center is an electron- deficient atom in a functional group (for example a carbon or hydrogen atom related to an electronegative atom like oxygen or nitrogen).