What is nucleofugacity?

Answer 1

if in a reaction the leaving group of the substrate is electron dense , it is called nucleofuge. The ability of nucleofuge to leave the substrate in a reaction is called its nucleofugacity .

Answer 2

Nucleofugacity refers to the tendency or ability of a nucleofuge (atom or group that can leave a molecule, often through a nucleophilic substitution reaction) to depart the molecule during a chemical reaction. It is used to describe the leaving group ability of a nucleofuge in a reaction mechanism. A more nucleofugacity nucleofuge will tend to leave the molecule more readily.