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Compound (X) on reduction with LiAlH(4) ...

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)`.

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
`4BF_(3)(X)+3LiAlH_(4)overset("Ether")to2B_(2)H_(6) (Y)+3 LiAlF_(4) , B_(2)H_(6)+3O_(2)to B_(2)O_(3)+3H_(2)O+`Heat.
Molecular weight of compound `(Y)=21.76+6=27.76`.
`%` of `H` in compound `(Y)` i.e., `B_(2)H_(6)=6/27.76xx100=21.72`
`X` can also be `BCl_(3)` according to the following reaction, `4BCl_(3)(X)+3LiAlH_(4)to 3AlCl_(3)+3LiCl+2B_(2)H_(6)(Y)`
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