$Sn ^{2+}+2 e ^{-} \rightarrow Sn$
$Sn ^{4+}+4 e ^{-} \rightarrow Sn$
The electrode potentials are; $E _{ Sn ^{2+} / Sn }^{\circ}=-0.140\, V$ and $E _{ Sn ^{4+} / Sn }^{\circ}=0.010\, V$. The magnitude of standard electrode potential for $Sn ^{4+} / Sn ^{2+}$ i.e. $E _{ Sn ^{4+} / Sn ^{2+}}^{\circ}$ is $.....\times 10^{-2}\, V$. (Nearest integer)
$Sn ^{+4}+4 e ^{-} \rightarrow Sn \quad \Delta G _{2}^{0}=-4 \times 0.01 \times F$
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$Sn ^{+4}+2 e ^{-} \rightarrow Sn ^{+2} \quad \Delta G _{3}^{0}=-2 \times E _{ Sn ^{+4} / Sn ^{+2}}^{0} \times F$
$\Delta G _{3}^{0}=\Delta G _{2}^{0}-\Delta G _{1}^{0}$
$-2 \times E ^{0} \times F =-(0.04+0.28) \times F$
$E ^{0}=0.16$ volt $=16 \times 10^{-2} \,V$
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$CH_3-COOH$ $\mathop {\xrightarrow{{(i)\,B{r_2}/P}}}\limits_{(ii)\,NaCN\,(iii)\,{H_2}O/{H^ \oplus }/\Delta } \,[X]$
$[X]$ will be :