A) `B_(2)H_(6)+6NH_3underset(-12H_2)overset(450K)rarrunderset("Inorganic graphite")underset("Borazinc(or)")(2B_3N_3H_6)overset(Delta)rarrunderset("Inoganic graphite")((BN)_x)` B) `2BF_3+6LiHoverset(450K)rarrunderset("Diborane")(B_2H_6)+6LiF` Two electron three centre bond ` rarr B_(2)H_6` D) `sp^3` hybride orbitals `rarr B_(2)H_(6),AlCl_3` (vapour)
