The addition of HI to the double bond of prop | vedclass

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(B) The addition of $HI$ to propene $(CH_3-CH=CH_2)$ follows Markovnikov's rule.In the first step,the electrophile $H^+$ attacks the double bond to fo

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More stable carbocation

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(B) The addition of $HI$ to propene $(CH_3-CH=CH_2)$ follows Markovnikov's rule.In the first step,the electrophile $H^+$ attacks the double bond to form a carbocation intermediate.Two possible carbocations can be formed: $CH_3-CH^+-CH_3$ (secondary carbocation) and $CH_3-CH_2-CH_2^+$ (primary carbocation).The secondary carbocation is more stable due to the inductive effect and hyperconjugation of the two methyl groups.Therefore,the nucleophile $I^-$ attacks the secondary carbocation to form isopropyl iodide $(CH_3-CH(I)-CH_3)$.

The addition of $HI$ to the double bond of propene yields isopropyl iodide and not $n$-propyl iodide because the addition proceeds through the formation of:

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