(a)
What are the numeriacl values of (B) and (C) ?

Explanation

a.
Thus, the number of isomers excluding enantiomers is 4.
b.
Thus, the number of isomers excluding enantiomers is 4.
Note: The products `B_(1)` and `C_(1), B_(2)` and `C_(2), B_(3)` and `C_(3), B_(4)` and `C_(4)` are same. If the reaction (a) is carried out with excess of `B_(2)D_(6) + THe + H_(2)O_(2)I O^((-))H` and (b) is carried out with excess of `Hg(OAc)_(2) + H_(2)O + NaBD_(4)`, then in place of `H_(b)D` will come in all products `B_(1)` and `C_(1)`, `B_(1)` and `C_(2)`, `B_(3)` and `C_(3)` and `B_(4)` and `C_(4)` would be different.