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

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

Options

Correct answer

C. Q

Step-by-step solution

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

\mathrm{P}, \mathrm{Q}

, R \& S compound Q will form most stable carbocation intermediate since it is resonance stabilized. Following are the four molecules "P", "Q", "R" and "S". Which one among the four molecules will react with H-Br_ (aq)

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