MCQ
Rate of ${S_{{N^1}}}$ in given compound is


- ✓$A > B > C$
- B$C > B > A$
- C$A > C > B$
- D$B > A > C$

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$Br^-+ CH_3OH \rightarrow BrCH_3 + OH^-,$ is due to
$Fe^{3+} + e \to Fe^{2+}\, ;\, E^o = 0.771\,volt$
$I_2 + 2e \to 2I^-\, ;\, E^o = 0.536\,volt$
$E^o$ cell for the cell reaction
$2Fe^{3+} + 2I^-\to 2Fe^{2+}+ I_2$ is
$(A)$ $BF _{3}$
$(B)$ $SiCl _{4}$
$(C)$ $PCl _{5}$
$(D)$ $SF _{6}$