Oxidation involves

Observe the following reactions:
$I$. $2H_2O_{(l)} + 2Na_{(s)} \rightarrow 2NaOH_{(aq)} + H_{2(g)}$
$II$. $2H_2O_{(l)} + 2F_{2(g)} \rightarrow 4H^{+}_{(aq)} + 4F^{-}_{(aq)} + O_{2(g)}$
Identify the correct statement from the following:

The conversion of sugar $C_{12}H_{22}O_{11} \to CO_2$ is

When ammonia is heated with cupric oxide,the ammonia molecule $.......$

What is a redox couple?

In the reaction,$2KMnO_4 + 16HCl \rightarrow 5Cl_2 + 2MnCl_2 + 2KCl + 8H_2O$,the reduction product is