Question
In the presence of peroxide, $$HCl$$ and $$HI$$ do not give anti-Markownikoff’s addition of alkenes because :
A.
One of the steps is endothermic in $$HCl$$ and $$HI$$
B.
Both $$HCl$$ and $$HI$$ are strong acids
C.
$$HCl$$ is oxidizing and the $$HI$$ is reducing
D.
All the steps are exothermic is $$HCl$$ and $$HI$$
Answer :
One of the steps is endothermic in $$HCl$$ and $$HI$$
Solution :
Anti-Markownikoff addition is possible only in case of $$HBr$$ and not in $$HCl$$ and $$HI.$$ In $$HBr$$ both the chain initiation and propagation steps are exothermic, while in $$HCl,$$ first step is exothermic, and second step is endothermic and in $$HI,$$ no step is exothermic. Hence $$HCl$$ and $$HI$$ do not undergo anti-Markownikoff’s addition.