####27. Compound on reduction with gives a hydride containing hydrogen alongwith other products. The compound reacts with air explosively resulting in boron trioxide. Identify and . Give balanced reactions involved in the formation of and its reaction with air.
Draw the structure of .
(2001, 5M)
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Solution:
- Compound a hydride + other compound. Hydride contains hydrogen.
Therefore, is a hydride of boron and it is obtained by reduction of with . So, is either or .
Molar mass of
Structure of

(a) There are 4 terminal bonds.
(b) There are two 3-centre-2-electron bridged bonds.
(c) Terminal planes are perpendicular to bridged bonds.