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 CI2 Laboratory method of preparation of diborane 2NaBH4(s)+I2→B2H6(g)+2NaI(s)+H2(g)
Hence correct option is c.
THEORY
Preparation:
1. By treating boron trifluoride with LiAlH4 in diethyl ether. 4BF3+3LiAlH4ether⟶2B2H6+3Li[AlF4]
2. Laboratory method of preparation of diborane. 2NaBH4+I2⟶B2H6+2NaI+H2
3. By treating BF3 with NaH 2BF3+6NaH450 K⟶B2H6+6NaF