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How does ammonia react with diborane ?...

How does ammonia react with diborane ?

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Diborane on treating with ammonia gives different products.
(a) With excess of ammonia at high temperature it forms boron nitride.
`nB_(2) H_(6) underset(NH_(3))overset("heat") (rarr)(BN)_(2n) + 3nH_(2(g))`
(b ) With ammonia at `200^(@)` C forms borazine `3B_(2)H_(6) +6NH_(3) rarr underset(" borazine ") (2B_(3) N_(3)H_(6))+12H_(2)uarr`
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