- AClemmensen's reduction
- BCannizzaro reaction
- CRosenmund's reduction
- ✓Oppenaur's oxidation
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($en =$ ethylenediamine)

$1.\,Zn|Z{n^{2 + }}\,\left( {1\,M} \right)||C{u^{2 + }}\left( {1\,M} \right)|Cu$
$2.\,Zn|Z{n^{2 + }}\,\left( {0.1\,M} \right)||C{u^{2 + }}\left( {1\,M} \right)|Cu$
$3.\,Zn|Z{n^{2 + }}\,\left( {1\,M} \right)||C{u^{2 + }}\left( {0.1\,M} \right)|Cu$
are represented by $E_1,\,E_2,\,E_3$. Which of the following statement is true?
$(I)$ The principal reducing product is $NO$ gas
$(II)$ $Cu$ metal is oxidised to $Cu^{2+}$ ( aq.) ion which is blue in colour.
$(III)$ $NO$ is paramagnetic and has one unpaired electron in antibonding molecular orbital
$(IV)$ $NO$ reacts with $O_2$ to produce $NO_2$ which is linear in shape
Choose the correct statements

Cu+ → Cu2+ + Cu
3MnO4– + 4H+ → 2MnO4– + MnO2 + 2H2O
2KMnO4 → K2MnO4 + MnO2 + O2
2MnO4– + 3Mn2+ + 2H2O → 5MnO2 + 4H+
Total sum of oxygen atoms in Product $A$ and Product $B$ are .........