Intermediates formed in the reactions P and Q | vedclass

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(B) The peroxide effect (Kharasch effect) is only observed with $HBr$ and not with $HCl$ or $HI$.In reaction $P$,the electrophilic addition of $HCl$ t

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$P 	o CH_3-CH^{+}CH_3$,$Q 	o CH_3-CH^{+}CH_3$

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(B) The peroxide effect (Kharasch effect) is only observed with $HBr$ and not with $HCl$ or $HI$.In reaction $P$,the electrophilic addition of $HCl$ to propene follows Markovnikov's rule,forming the stable secondary carbocation intermediate $CH_3-CH^{+}CH_3$.In reaction $Q$,despite the presence of peroxide,$HCl$ does not undergo free-radical addition because the bond dissociation energy of $H-Cl$ is too high for the peroxide to initiate the radical chain mechanism.Therefore,reaction $Q$ also proceeds via the electrophilic addition mechanism,forming the same secondary carbocation intermediate $CH_3-CH^{+}CH_3$.

Intermediates formed in the reactions $P$ and $Q$ are:
$P: CH_3-CH=CH_2 \xrightarrow{HCl}$
$Q: CH_3-CH=CH_2 \xrightarrow[\text{Peroxide}]{HCl}$

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Intermediates formed in the reactions $P$ and $Q$ are:$P: CH_3-CH=CH_2 \xrightarrow{HCl}$$Q: CH_3-CH=CH_2 \xrightarrow[\text{Peroxide}]{HCl}$