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Give two methods of preparation of dibor...

Give two methods of preparation of diborane.

Text Solution

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1)Diborane can be prepared by treating boron trifluoride with `LiAlH_4` in diethyl ether.
`4BF_3 + 3LiAlH_4 to 2B_2H_6 + 3LiF + 3AlF_3`
(2)In the laboratory it is conveniently prepared by the oxidation of sodium borohydride with iodine.
`2NaBH_4 + I_2 to B_2H_6 + 2NaI + H_2`
(3)On large scale it is prepared by reaction of `BF_3` with sodium hydride.
`2BF_3 + 6NaH overset"450 K"to B_2H_6 + 6NaF`.
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Knowledge Check

  • The reactants in the industrial method of preparation of diborane are

    A
    `BCl_3 + Li AlH_4`
    B
    `BF_3 + LiAlH_4`
    C
    `BF_3 + LiH`
    D
    `BF_3 + H_2`

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