First slide

Diborane

Question

Which of the following is laboratory method for the preparation of B₂H₆ ?

Moderate

A

$4 {BF}_{3} + 3 {LiAlH}_{4} \overset{Diethyl ether}{⟶} 2 B_{2} H_{6} + 3 LiF + 3 {AlF}_{3}$
B

$2 {NaBH}_{4} + I_{2} \overset{Polyether}{⟶} B_{2} H_{6} + 2 Nal + H_{2}$
C

$2 {BF}_{3} + 6 NaH \overset{450 K}{⟶} B_{2} H_{6} + 6 NaF$
D

All of the above

Solution

Laboratory method of preparation: Diborane is prepared in the laboratory by the oxidation of sodium borohydride with iodine in polyether as solvent.
$2 {NaBH}_{4} + I_{2} \overset{Polyether}{\to} B_{2} H_{6} + 2 NaI + H_{2}$

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