The species, which have less than electrons in the valence shell or the species, which have valence electrons, but has empty orbitals, so that the covalency can be spread beyond , are called as electron deficient species. is electron deficient compound because boron has only valence electron and is short of electrons. Therefore it can accept a pair of electrons from nucleophiles. is not electron deficient compound because silicon has valence electrons. It cannot spread its covalency beyond because silicon doesn’t have d- orbitals.
Final Answer:
The species, which have less than electrons in the valence shell or the species, which have valence electrons, but has empty orbitals, so that the covalency can be spread beyond , are called as electron deficient species. is electron deficient compound because boron has only valence electron and is short of electrons. Therefore it can accept a pair of electrons from nucleophiles. is not electron deficient compound because silicon has valence electrons. It cannot spread its covalency beyond because silicon doesn’t have d- orbitals.
