Na(BH 4 ) is ionic compiound containing BH 4 - tetrahydrido borate ion and in solid state NaBH 4 has sodium chloride structure. Not all tetrahydrido borates are ionic the beryllium, aluminium and transition metal borohydrides become increasingly covalent and volatile. In these type of tertahydrido borate the BH 4 - ion form covalent bond with metal ion. One or more H atoms in BH 4 – act as a bridging and bond to metal forming a 3 center bond with 2 electron shared by 3 atoms. The BH 4 – is usually in that it may form 1, 2 or 3 such 3 center bonds to the metal ion when form covalent bond.

(i) Li[AlH 4 ] is used as a reducing agent in many reactions and it is prepared by excess LiH and AlCl 3. select incorrect staements about Li[AlH 4 ]