Following are the four molecules "P", "Q", "R" and "S".
Which one among the four molecules will react with $H - Br_{(aq)}$ at the fastest rate?

Question

Following are the four molecules "P", "Q", "R" and "S". Which one among the four molecules will react with H − Br ( aq ) ​ at the fastest rate?

TestHub · Accepted Answer

Addition of H − Br ( 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.

Chemistry - Hydrocarbon Question with Solution | TestHub

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