Chapter 113 of 2363 min read

Alkenes and alkynes: addition reactions, Markovnikov

Why this is asked: The peroxide (anti-Markovnikov) effect works only for HBr — not HCl or HI — because only the bromine free-radical chain steps are both energetically favourable; with HCl and HI, normal Markovnikov addition holds regardless of peroxide. That HBr-only exclusivity, not just "peroxide flips the rule," is what NEET actually tests.

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Test yourself

•Which one of the following compounds (shown) does not decolourise bromine water?
•Match List I (reactions, shown as structures) with List II (reagents/conditions): I. (reagent shown in figure) · II. $Cr O_{3}$ · III. $KMn O_{4} /KOH$ , $Δ \cdot$ IV. (i) $O_{3}$ (ii) $Zn$ – $H_{2} O$ Choose the correct answer from the options given below:

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