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Question

Which of the following reaction will give diborane as the product?

A
2NaBH4+I2
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B
LiAlH4+BF3
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C
Both (A) and (B)
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D
None of these
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Solution

The correct option is C Both (A) and (B)
In both the reactions, B2H6 will be formed.
In (a), Boron trifluoride reacts with LiAlH4 in diethyl ether to form diborane.
2NaBH4+I2B2H6+2NaI+H2

In (b),
3LiAlH4+4BF3ether−−2B2H6()+3LiF+3AlF3
The above reation is the laboratory method for preparation of diborane.
In both the reaction diborane gas is evolved. Hence, the correct answer is option (c).

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