MCQ
Which of these do not form Grignard reagent
- ✓$C{H_3}F$
- B$C{H_3}Cl$
- C$C{H_3}Br$
- D$C{H_3}I$
Thus fluoride is the less reactive to form the grignard reagent with $Mg.$
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(Given atomic member $\mathrm{V}=23, \mathrm{Mn}=25, \mathrm{Cr}=24$ )

$Mn^{2+} + 2e^- \rightarrow Mn,\, $$E^o = - 1.18\, V$
$Mn^{2+} \rightarrow Mn^{3+} + e^-,$ $ E^o = - 1.51 \,V$
The $E^o$ for the reaction $3Mn^{2+} \rightarrow Mn^o + 2Mn^{3+},$
and possibility of the forward reaction are respectively