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(A) The reaction of $1$-butene with $HCl$ is an electrophilic addition reaction.In the first step,the $\pi$-electrons of the double bond in $1$-butene

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(A) The reaction of $1$-butene with $HCl$ is an electrophilic addition reaction.In the first step,the $\pi$-electrons of the double bond in $1$-butene attack the electrophilic hydrogen atom of $HCl$.This leads to the breaking of the $H-Cl$ bond,releasing a chloride ion $(Cl^-)$ and forming a carbocation intermediate.According to Markovnikov's rule,the hydrogen adds to the carbon with more hydrogen atoms to form the more stable secondary carbocation $(CH_3-CH^+-CH_2-CH_3)$.Option $(A)$ correctly represents this mechanism where the alkene attacks the $H$ of $HCl$ to form a secondary carbocation.

Which of the following most accurately describes the first step in the reaction of hydrogen chloride with $1$-butene?

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