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Answer: 4. \(C_3H_6\)

Key idea: gaseous \(Br_2\) adds readily across a C=C bond; a more electron-rich alkene reacts faster.

\(C_3H_6\) (propene) beats \(C_2H_4\) because the methyl group donates electrons to the double bond (+I, hyperconjugation). \(C_2H_2\) is less reactive than alkenes, and \(C_4H_{10}\) is an alkane that reacts only by substitution in light.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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