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Question

Which of the following gives B2H6 on reaction with NaBH4.

A
LiAlH4
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B
O2
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C
I2
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D
H2O
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Solution

The correct option is C I2
Laboratory method of preparation of diborane
2NaBH4(s)+I2B2H6(g)+2NaI(s)+H2(g)
Hence correct option is c.

THEORY
Preparation:
1. By treating boron trifluoride with LiAlH4 in diethyl ether.
4BF3+3LiAlH4ether2B2H6+3Li[AlF4]
2. Laboratory method of preparation of diborane.
2NaBH4+I2B2H6+2NaI+H2
3. By treating BF3 with NaH
2BF3+6NaH450 KB2H6+6NaF

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