- AMagnesium halide
- ✓Grignard’s reagent
- CAlkene
- DAlkyne
This reaction is also called as Grignard’s reaction.
$R - X + Mg\mathop {\xrightarrow{{{\text{dry}}}}}\limits_{{\text{ether}}} \mathop {R - Mg - X}\limits_{{\text{Grignard's}}\,\,{\text{reagent}}} $
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$Pt _{( s )}\left| H _2( g , 1\,atm )\right| H ^{+}( aq , 1 M )|| Fe ^{3+}( aq ), Fe ^{2+}( aq ) \mid Pt ( s )$
When the potential of the cell is $0.712\,V$ at $298\,K$, the ratio $\left[ Fe ^{2+}\right] /\left[ Fe ^{3+}\right]$ is $.......$(Nearest integer)
Given: $Fe ^{3+}+ e ^{-}= Fe ^{2+}, E ^{\circ} Fe ^{3+}, Fe ^{2+} \mid Pt =0.771$
$\frac{2.303 RT }{ F }=0.06\,V$

$(A)$ $\left[ Ni \left( H _{2} O \right)_{2}( en )_{2}\right]^{2+}$
$(B)$ $\left[ Ni \left( H _{2} O \right)_{4}(\text { en })\right]^{2+}$ and
$(C)$ $\left[ Ni ( en )_{3}\right]^{2+}$ is ...... .