MCQ
Which is most reactive for $S_{N^2}$ reaction
- A

- B

- ✓

- D






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$0.48 + \log \left\{ { - \frac{{d[A]}}{{dt}}} \right\} = \log \left\{ { + \frac{{d[B]}}{{dt}}} \right\} + 0.7$
Then, $x : y$ is
