According to Markovnikov’s rule, the given alkene reacts with HCl in the presence of sodium peroxide follows,

CH3−CH2−CH=CH2+HCl → CH3−CH2−C(Cl)H−CH3

The mechanism of the above reaction with electrophilic addition and obeying Markovnikov’s rule

Step-1

HCl dissociate into ions in the presence of sodium peroxide

HCl→H+electrophile+Cl−nucleophile

Step-2:

The electrophile reacts with But-1-ene in an addition reaction.

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A=primary carbocation, B=secondary carbocation at this stage.

As a result, secondary carbocation has a higher stability than primary carbocation. As a result, the intermediate B will follow Markovnikov’s rule and continue the reaction.

Step-3

intermediate B carbocation reacts with chloride ion và forms the product 2-chloro butane.

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This 2-chloro butane is also known as secondary butyl chloride.


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