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A Lewis acid 'X' formed by the reaction ...

A Lewis acid 'X' formed by the reaction of `BF_3` with `LiAlH_(4)` in ether medium to gives a highly toxic gas. This gas when heated with `NH_(3)` gives a compound commonly known as inorganic benzene. The gas is

A

`B_(3)N_(3)H_(6)`

B

`BF_(3)`

C

`B_(2)O_(3)`

D

`B_(2)H_(6)`

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