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Question

The number of three centre two electron bonds in a molecule of diborane is:

A
zero
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B
two
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C
four
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D
six
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Solution

The correct option is B two
BH3 dimerizes to give diborane (B2H6), in which two hydrogen atoms are bridged and four hydrogen atoms are terminal.
In a three centre two electron bond, the two electrons are shared between three atoms.
These types of bonds are also as called banana bonds.

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