MCQ
Correct reactivity order of $S_N2$ reaction is


- ✓$(i) > (ii) > (iii)$
- B$(ii) > (iii) > (i) $
- C$(i) > (iii) > (ii)$
- D$(iii) > (i) > (ii)$

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Assertion $(A)$: There is a considerable increase in covalent radius from $\mathrm{N}$ to $\mathrm{P}$. However from $As$ to $Bi$ only a small increase in covalent radius is observed.
Reason $(R)$: covalent and ionic radii in a particular oxidation state increases down the group.
In the light of the above statement, choose the most appropriate answer from the options given below: