A Levels Chemistry (9701)•9701/11/M/J/21

Explanation
Propene reaction products via addition mechanisms
Steps:
- Identify propene as CH₃CH=CH₂, an unsymmetrical alkene.
- Evaluate each reagent's reaction: KMnO₄ variants for oxidation, HCl for electrophilic addition, steam for hydration.
- Apply Markovnikov's rule where applicable: H adds to carbon with more hydrogens.
- Match predicted product to table description.
Why C is correct:
- HCl undergoes electrophilic addition following Markovnikov's rule, yielding CH₃CHClCH₃ (2-chloropropane) as H⁺ adds to terminal carbon.
Why the others are wrong:
- A: Hot acidified KMnO₄ causes oxidative cleavage to CH₃COOH + HCOOH, not propan-1,2-diol.
- B: Cold dilute KMnO₄ performs syn dihydroxylation to propan-1,2-diol, not 2-bromopropane.
- D: Steam (acid-catalyzed hydration) follows Markovnikov's rule to propan-2-ol, not propan-1-ol.
Final answer: C
Topic: Hydrocarbons
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