MCQ
Which of the reactions shown given will be faster?
- AReaction $1$
- ✓Reaction $2$
- CBoth have equal rates of reaction.
- DCannot be predicted.
✓
Answer
Correct option: B.
Reaction $2$
Since given reaction is $\ce{S_{N2}}$ and we know that $\ce{S_{N2}}$ favoured in presence of polar aprotic solvent like crown$-$ethers, $\ce{DMSO, DMF}$, etc not $\ce{H_2O}$ which is polar protic solvent.
In reaction $2$ polar solvent $($crown ether$)$ is used.
Thus reaction $2$ is faster than reaction $1$.
In reaction $2$ polar solvent $($crown ether$)$ is used.
Thus reaction $2$ is faster than reaction $1$.
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