MCQ
Arrange in order of increasing $S_N1$ reaction rate.


- ✓$iv < ii < iii < i$
- B$i < ii < iii < iv$
- C$iv < i < iii < ii$
- D$iv < i < ii < iii$

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Figure $\xrightarrow[{0\, - \,5\,\,{\,^o}C}]{{HN{O_2}}}$ $P$ $\xrightarrow{{HB{F_4}}}Q$ $\xrightarrow[{Cu,\,\,\Delta }]{{NaN{O_2}}}R$