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
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a
4
b
6
c
8
d
2
answer is D.
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Detailed Solution
The two boron atoms and the four terminal hydrogen atoms Ht are coplanar.Terminal hydrogens can be replaced by methyl groups but not the bridged hydrogens.Exhaustive methylation gives CH34B2H2;