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Question
Chemistry
Which of the following reactions can be used to prepare diborane? I) BF3 + LiAlH4 ->[ether] II) BF3 + NaH ->[450 k] III) Na2B4O7 + H2O -> IV) NaBH4 + I2 ->
Q. Which of the following reactions can be used to prepare diborane?
I)
BF
X
3
+
LiAlH
X
4
ether
II)
BF
X
3
+
NaH
450
k
III)
Na
X
2
B
X
4
O
X
7
+
H
X
2
O
IV)
NaBH
X
4
+
I
X
2
5507
201
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A
I, II , III
100%
B
II , III only
0%
C
III , IV only
0%
D
I, II , IV
0%
Solution:
Following reactions are used for the preparation of diborane:
(
I
)
4
B
F
3
+
3
L
i
A
l
H
4
Diethyl ether
Diborane
2
B
2
H
6
+
3
L
i
F
+
3
A
l
F
3
(
II
)
2
B
F
3
+
6
N
a
H
450
K
Diborane
B
2
H
6
+
6
N
a
F
(Industrial method)
(
I
V
)
2
N
a
B
H
4
+
I
2
DIGLYME
(
MeOCH
)
X
2
CH
X
2
)
O
X
2
Diborane
B
2
H
6
+
(Lab method)
2
N
a
I
+
H
2
↑
Reaction
(
III
)
is used for the preparation of boric acid. i.e.,
N
a
2
B
4
O
7
+
7
H
2
O
2
N
a
O
H
+
Boric acid
4
H
3
B
O
3