Select the option showing how to prepare (BN)x from B2H6.
1
\(\rm B_2 H_6 \ + \ HNO_2 \ \xrightarrow{ \ \ h\nu \ \ }\)
2
\(\rm B_2 H_6 \ + \ Excess \ NH_3 \ \xrightarrow{ \ \ \Delta \ \ }\)
3
\(\rm B_2 H_6 \ + NH_3 \ \xrightarrow{ \ \ \Delta \ \ }\)
4
\(\rm B_2H_6 \ + \ HNO_2 \ \xrightarrow{ \ \ \Delta \ \ }\)
5
Not Attempted