Question

Why is peroxide effect not valid with hcl and hi?

Answer 1

Explanation:

Peroxide effect not valid with HCland HI,

• because the HBr adds on the in contradictory way in the presence of organic peroxides, this is often known as the peroxide effect or anti-Markovnikov addition.

• Like the radicalar halogenation of alkanes, Br2 is more selective than Cl2.

• F2 is very much reactive and less selective than Cl2 and I2 is non-reactive.

• The adition of Br radical to a double bond is an endothermic process while the adition of Cl radical is exothermic.

• With HCl, the second half of the propagation stage is very slow.

• The first step of the propagation stage turns out to be endothermic and this slows the reaction down.

• Not enough energy is released when the weak carbon-iodine bond is formed.