First slide

Diborane

Question

The number of 2-centre-2-electron and 3-centre-2-electron bonds in B₂H₆, respectively, are :

Moderate

A

2 and 4
B

2 and 1
C

2 and 2
D

4 and 2

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.
The number of atoms involved in bridged bonds in one diborane molecule is four.

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