How is diborane prepared ? Explain its structure .

Explanation

Prepatation of Diborane :
(1)Boron trifluoride on reduction with LiH at 450 K gives Diborane.
`2BF_3 + 6LiH to B_2H_6 + 6LiF`
(2)On passing silent electric discharge through a mixture of boron trichloride and hydrogen, diborane is formed.
`2BCl_3+ 6H_2 to underset"Diborane"(B_2H_6) + 6HCl`
Molecules in which the central atom gets less than octet configuration are called electron deficient molecules
Ex:(1)Diborane `B_2H_6`
(2)Boron trifluoride `BF_3`