First slide

Diborane

Question

Number of hydrogen atoms of diborane molecule which cannot be replaced by methyl groups when diborane is subjected to methylation is

Moderate

A

4
B

3
C

2
D

1

Solution

Two boron atoms and four terminal hydrogen atoms (H_t) lie in the same plane. The bridged hydrogen atoms (H_b) lie above and below the plane.
Only H_t can be replaced but not H_b.
Final product of methylation is B₂H₂(CH₃)₄ ;

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