Which of the following reactions can be used to prepare diborane? I )     BF 3 + LiAl H 4 → ether II ) BF 3 + NaH ⟶ 450   K III )   Na 2 B 4 O 7 + H 2 O ⟶ IV )   NaBH 4 + I 2 ⟶

Step-by-step solution

Binary compounds of boron and hydrogen are called boron hydrides or boranes. It can be prepared with following reaction. 4 BF 3   +   3 LiAlH 4   → ether   2 B 2 H 6   +   3 LiF   +   3 AlF 3 2 BF 3   +   6 NaH   →   B 2 H 6   +   6 NaF 2 NaBH 4   +   I 2   → B 2 H 6   +   2 NaI   +   H 2