MCQ
Find out correct stability order in the following carbocations


- ✓$IV > I > III > II$
- B$IV > III > I > II$
- C$I > IV > III > II$
- D$I > III > IV > II$

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A current was passed for $10$ hours. $10.8\ g Ag$ was deposited at cathode in $(III)$ electrolytic cell during electrolysis if current efficiency is $50\%.$
If $Z_1,$ $Z_2$ and $Z_3$ be the electrochemical equivalent in the formation of $H_2, Cu$ and $Ag$ respectively, hence $Z_1 : Z_2 : Z_3$ would be


[Given : $h =6.63 \times 10^{-34}\, J \,s$, and $c =3 \times 10^{8} \,m\, s ^{-1}$ ]