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?

Question

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?

Aicharya · Accepted Answer

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…

Solution