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Diborane

Which of the ...

Question

Which of the following gives $B_{2} H_{6}$ on reaction with $N a B H_{4} .$

A

L i A l H_{4}

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B

O_{2}

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C

I_{2}

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D

H_{2} O

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Solution

The correct option is C $I_{2}$
Laboratory method of preparation of diborane
$2 N a B H_{4} (s) + I_{2} \to B_{2} H_{6} (g) + 2 N a I (s) + H_{2} (g)$
Hence correct option is c.

THEORY
Preparation:
1. By treating boron trifluoride with $L i A l H_{4}$ in diethyl ether.
$4 B F_{3} + 3 L i A l H_{4} ether ⟶ 2 B_{2} H_{6} + 3 L i [A l F_{4}]$
2. Laboratory method of preparation of diborane.
$2 N a B H_{4} + I_{2} ⟶ B_{2} H_{6} + 2 N a I + H_{2}$
3. By treating $B F_{3}$ with NaH
$2 B F_{3} + 6 N a H 450 K ⟶ B_{2} H_{6} + 6 N a F$

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