Chemistry · Aromatic Compounds

JEE Main 2025 — 24 January, Morning Shift — Question 27

Following are the four molecules "P", "Q", "R" and "S".

Which one among the four molecules will react with $\mathrm{H}-\mathrm{Br}(\mathrm{aq})$ at the fastest rate ?

Answer: B

Addition of $\mathrm{H}-\mathrm{Br}_{(\mathrm{aq})}$ to alkene follows electrophilic addition mechanism. In the rate determining

step a carbocation intermediate is formed. Among P, Q, R & S compound Q will form most

stable carbocation intermediate since it is resonance stabilized.

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