MCQ
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 ?

- AS
- ✓Q
- CR
- DP


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[Given : Molal elevation constant of water $K _{ b }=0.5\, \,K\, kg\, mol ^{-1}$ boiling point of pure water $\left.=100^{\circ} C \right]$