When Propene is treated with $\mathrm{HBr}$ in the presence of peroxides, the major product formed is:}
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Peroxide effect is observed only with HBr.
\[
\text{Alkene} + \mathrm{HBr}
\xrightarrow{\text{Peroxide}}
\text{Anti-Markovnikov Product}
\]
HCl and HI do not show peroxide effect.