Which reaction type converts ethene (C2H4) into bromoethane (C2H5Br) upon reaction with hydrogen bromide (HBr)?
Answer and explanation
Correct answer: A. Electrophilic addition
- Step 1: Ethene contains an electron-rich carbon-carbon double bond (pi bond) that attracts electrophiles like H+ from HBr.
- Step 2: The pi bond breaks and H and Br add across the carbons in an electrophilic addition reaction.
Answer
Electrophilic addition.
Why not the others: 'Nucleophilic substitution' typical of haloalkanes undergoing nucleophilic attack; 'Free-radical substitution' occurs in alkanes under ultraviolet light; 'Elimination' removes atoms to form double bonds.
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