Question

In the presence of peroxide, hydrogen chloride and hydrogen iodide do not give anti-Markownikoff's addition to alkenes because

(a) both are highly ionic

(b) one is oxidising and the other is reducing

(c) one of the steps is endothermic in both the eases

(d) all the steps are exothermic in both the cases

Answer 1

Correct option (c) one of the steps is endothermic in both the eases

Explanation:

In the presence of peroxide, HCI and If HI react with alkene as follows

1st Step :

For HCl step I (b) is endothermic and step II is exothermic. While for HI step I

(b) is exothermic and step II is endothermic. Hence, in each case, one of the steps is exothermic, due to this reason HCl and HI do not give anti-Markownikoff's addition to alkenes.