Which of the following reactions is not used to prepare diborane?

Options

A. `BF_(3) + NaH overset(180^(@)C)rarr`
B. `B_(2)O_(3) + CaF_(2) + conc.H_(2)SO_(4) rarr`
C. `Na[BH_(4)] + I_(2) underset("solution")overset("Diglyme")rarr`
D. `(C_(2)H_(5))_(2)O.BF_(3) + LiAlH_(4) rarr`

Answer

B

Explanation

It leads to the formation of boron trifluoride:
`B_(2)O_(3) + 3CaF_(2) + conc.3H_(2)SO_(4) overset(Delta)rarr 2BF_(3) + 3CaSO_(4) + 3H_(2)O`
Other possibility is
`B_(2)O_(3) + 6NH_(4)BF_(4) overset(Delta)rarr 8BF_(3) + 6NH_(3) + 3H_(2)O`
(1) `2BF_(3) + 6NaH overset(180^(@)C)rarr B_(2)H_(6) + 6NaF`
(2) `2Na[BH_(4)] + I_(2) rarr B_(2)H_(6) + H_(2) + 2NaI`
(4) `4[Et_(2)O.BF_(3)] + 3Li[AlH_(4)] rarr 2B_(2)H_(6) + 3Li[AlF_(4)] + 4Et_(2)O`