First slide

Diborane

Question

The number of three centred, 2 electron bonds in diborane is

Moderate

A

2
B

4
C

3
D

6

Solution

In diborane each B atom undergoes sp³hybridisation, it contains two B-H-B bridges. Each bridge bond is formed by overlapping of one "B"sp³hybrid orbital with one electron, hydrogen s-orbital with one electron and another boron sp³ hybrid orbital without electron. That is the bridge head bond is a electron deficient three centre two electron bond.

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