Q10 / 180 · COMEDK 2025 (10 May Shift 3) · Chemistry
Identify the type of reaction:
- Correct answerAElectrophilic addition
- BNucleophilic addition
- CFree radical addition
- DFree radical substitution
Solution
The reaction shown is the addition of hydrogen bromide (HBr) to propene ($CH_3-CH=CH_2$).
The reaction proceeds via the electrophilic addition mechanism. In the first step, the electrophile $H^{+}$ from HBr attacks the double bond to form the more stable secondary carbocation ($CH_3-CH^{+}-CH_3$).
In the second step, the nucleophile $Br^{-}$ attacks the carbocation to form 2-bromopropane ($CH_3-CH(Br)-CH_3$).
This follows Markovnikov's rule, which is characteristic of electrophilic addition reactions to alkenes.
Answer: Electrophilic addition
The reaction proceeds via the electrophilic addition mechanism. In the first step, the electrophile $H^{+}$ from HBr attacks the double bond to form the more stable secondary carbocation ($CH_3-CH^{+}-CH_3$).
In the second step, the nucleophile $Br^{-}$ attacks the carbocation to form 2-bromopropane ($CH_3-CH(Br)-CH_3$).
This follows Markovnikov's rule, which is characteristic of electrophilic addition reactions to alkenes.
Answer: Electrophilic addition
Hence, the correct answer is option: 'A'.