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Boron does not react directly with hydro...

Boron does not react directly with hydrogen. Suggest one method to prepare diborane from `BF_(3)`.

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(i) Boron does not react directly with hydrogen. However, it forms a variety of hybrides called boranes.
(ii) The simplest borane is diborane - `B_(2)H_(6)`. Other larger boranes can be prepared from diborane.
(iii) Treatment of gaseous boron trifluoride with sodium hybride around 450 K gives diborane. To prevent subsequent pyrolysis, the product diborane is trapped immediately.
`2BF_(3) + 6NaH overset(450K)to B_(2)H_(6) + 6NaF`
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