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p-Block Elements: Groups 13 and 14
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Boron compounds: diborane, boric acid, borax, boron halides
NEET level
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Difficulty 1 of 3
pb007
Diborane,
B
X
2
H
X
6
, contains how many three-centre two-electron (3c-2e) bonds?
A
4
B
0
C
6
D
2
Answer: D
Two
B
−
H
−
B
bridges each contain one 3c-2e bond, and the four terminal
B
−
H
bonds are ordinary 2c-2e bonds. So there are 2 three-centre bonds.
Practice p-Block Elements: Groups 13 and 14
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