A compound of boron X reacts at 200^(@)C...

A compound of boron X reacts at `200^(@)C` temperature with `NH_(3)` to give another compound Y which is called as inorganic benzene. The compound Y is a colourless liquid and is highly light sensitive. Its melting point is `-57^(@)C`. The compound X with excess of `NH_(3)` and at a still higher temperature gives boron nitride `(BN)_(n)`. The compounds X and Y are respectively:

`BH_(3)` and `B_(2)H_(6)`

`NaBH_(4)` and `C_(6)H_(6)`

`B_(2)H_(6)` and `B_(3)N_(3)H_(6)`

`B_(4)C_(3)` and `C_(6)H_(6)`

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