$B_2{H}_6+N{H}_3\stackrel{{120}^0}{\to }X$

What is X ?

Following are the actions of ammonia on diborane under different conditions.

$B_2{H}_6+2N{H}_3\stackrel{{120}^0}{\to }{B}_2{H}_6.2N{H}_3$$\equiv$${\left[B{H}_2{\left(N{H}_3\right)}_2\right]}^{+}{\left[B{H}_4\right]}^{-}$

$3B_2{H}_6+2N{H}_3\stackrel{{200}^{\circ }C}{\to }{B}_3{N}_3{H}_6+12H_2$

$B_2{H}_6+2N{H}_3\stackrel{{200}^0}{\to }{B}_2{H}_6.2N{H}_3 ; 1:2 proportion$

$B_3{N}_3{H}_6\stackrel{{200}^{\circ }C}{\to }3{\left(BN\right)}_3+3n{H}_2$