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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$C_{(graphite)} + CO_{2(g)} \rightarrow 2CO _{(g)}$
are $170\, kJ$ and $170\, J K^{-1},$ respectively. This reaction will be spontaneous at ............ $\mathrm{K}$