InterviewSolution
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InterviewSolution
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Compound `(X)` on reduction with `LiAlH_(4)` gives a hydride `(Y)` containing `21.72 %` hydrogen along with other products. The compound `(Y)` reacts with air explosively resulting in formation of boron trioxide. Identify `(X)` and `(Y)`. Give balanced reactions involved in the formation of `(Y)` and its reaction with air. Give the structure of `(Y)`. |
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Answer» According to availbale information Compound (X) `overset(LiAIH)rarr"Hydride"(Y)` (contains 21.72% hydrogen)+other produce Hydride (Y) `overset(O_(2)("air"))rarrB_(2)O_(3)`+other products. The data shows that the compound (X) is a boron compound an composed (Y) is a hydride of boron which reacts explosively with air to form `B_(2)O_(3)` . The boron (Y) is most probably diborane `(B_(2)H_(6))` because it contains in it nearly 21.72% hydrogen which can be calculated as follows: `B_(2)H_(6)-=6H` `(2xx10.8xx6xx1)` parts ( 6xx1) parts 27.6g 6.0g % of hydrogen (H) in `B_(2)H_(6)=((6.0 g))/((27.6g))xx100=21.74%` Thus, the compound (X) is a halde of boron (e.g. `BF_(3)` or `BCl_(3)`) and the reaction involved is: ltbr. `4BCl_(3)+3LiAIH_(4)rarr3AICl_(3)+3LiCl+2B_(2)H_(6)` ltbr. [X] [Y] `B_(2)H_(6)+3O_(2)overset("Heat")rarrB_(2)O_(3)+3H_(2)O` For the structure of diborane, please consult section 11.4. |
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