$2 O^{2-} \rightarrow O_{2}+4 e^{-}$
$4 A g^{+}+2 O^{2-} \rightarrow O_{2}+4 A g \ldots( i )$
Amount of silver generated $=0.108 g$ No. of mole of $A g=\frac{0.108}{108}=0.001 mole$
No. of mole of $O_{2}$ generated from equation (i) $\frac{0.001}{4}$
$\begin{aligned} \text { volume of } O_{2} =\frac{0.001}{4} \times 22.4 \times 10^{3} cm ^{3} \\ =5.6 cm ^{3} \end{aligned} $
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$(F = 96500 \,C\, mol^{-1})$
$\mathop {(A)}\limits_{ gives\,\,positive ~\\ iodoform\,Test } \xrightarrow[\begin{subarray}{l} (ii)\,{H^ + },{H_2}O + ~\\ (iii)\,conc.\,{H_2}S{O_4}/\Delta \end{subarray} ]{{{\text{(i) C}}{{\text{H}}_{\text{3}}}{\text{MgBr}}}}(B)\xrightarrow{{{O_3}/Zn,{H_2}O}}$