Compounds containing boron and hydrogen are known as boron hydrides or boranes, diborane being the simplest one. Lower boranes are colourless gases while higher are volatile liquids or solids. As the molecular weight increases, they becomes more stable in air and less sensitive to water . All boranes act as Lewis acid and can accept electron pairs.
(i) When diborane is heated at high temperature with ammonia, to form a product, which has a structure, similar to that of –
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(i)
Sol. B 2 H 6 + NH 3 
(BN) x Boron nitride
Boron nitride has a structure, similar to that of graphite.
(ii)
Sol. In diborane B is sp 3 hybridised.
(iii)
Sol. B 2 H 6 + 6Cl 2 ⎯→ 2BCl 3 + 6HCl (Vigorous reaction)
B 2 H 6 + Br 2 ⎯→ B 2 H 5 Br + HBr (slow reaction)
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