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1. Electrophiles are electrons deficient species , positively
charge and nucleophiles are electrons rich species
carrying negative charge or lone pair of electrons.
When an electron deficient species (electrophile) attack
the electron rich reactant to give addition product it is
called nucleophile addition, e.g. ketone & aldehyde.
When an election rich species attack the election
deficient to give addition product it is called electrophilic
addition reaction. e.g. Alkanes and alkynes.