First slide

Diborane

Question

Hydrides of boron are not very stable. Diborane is one of the most important member of Borane family. Number of hydrogen atoms which cannot be replaced by methyl groups is/are from a molecule of diborane are

Moderate

A

4
B

6
C

8
D

2

Solution

The two boron atoms and the four terminal hydrogen atoms $(H_{t})$ are coplanar.
Terminal hydrogens can be replaced by methyl groups but not the bridged hydrogens.
Exhaustive methylation gives ${({CH}_{3})}_{4} B_{2} H_{2}$ ;

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