Question

what is nucleophilic and electrophilic centre.

Answer 1

Answer:

Nucleophile means "nucleus loving" which describes the tendency of an electron rich species to be attracted to the positive nuclear charge of an electron poor species, the electrophile . The more available the electrons, the more nucleophilic the system. Hence the first step should be to locate the nucleophilic center.

Electrophiles are atoms or molecules known to be electron deficient and that carry a partial (or fully) positive charge and will seek an electron pair to form a covalent bond.

Answer 2

Answer:

(1) The species which are electron seeking species i.e. electron deficient species are called electrophiles or electrophilic centre

(2) A polyatomic electrophile has an electron deficient atom in it called the electrophilic centre.

(3) They are positively charged species like H^+, NO^+_2, or neutral molecules with incomplete octet of electrons like BF_3, AICl_3, etc.