Question

Give two methods of preparing of diborane.​

Answer 1

Answer:

The industrial synthesis of diborane involves the reduction of BF3 by sodium hydride, lithium hydride or lithium aluminium hydride: 8 BF3 + 6 LiH → B2H6 + 6 LiBF. Two laboratory methods start from boron trichloride with lithium aluminium hydride or from boron trifluoride ether solution with sodium borohydride.

Explanation:

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Answer 2

AnSwer :-

Chemical formula of diborane :- B$_{2}$H$_{6}$

The methods of preparing diborane :

$\Large\star$In industries, diborane is prepared the reaction between boran-trifluoride, lithium hydride.

$\sf 2BF_{3} + 6LiH \xrightarrow{\text{ \sf 450k}}B_{2} H_{6}+6LiF$

$\Large\star$Boran-trichoride and hydrogen mixture is subjected to silent electric discharge at low pressure to form diborane.

$\sf 2BCl_{3}+6H_{2} \longrightarrow B_{2}H_{6} +6HCl$

$\Large\star$Boran trichoride undergoes reduction with LiAIH$_{4}$ to form diborane.

$\sf3LiAIH_{4}+4BCl_{3} \xrightarrow{\text{ \sf Ether \: }}2B_{2}H_{6}+3AlCl_{3}+3LiCl$