Determine whether each of the following changes represents oxidation or reduction

Determine whether each of the following changes represents oxidation or reduction my answer: oxidation Reducatin NO2- to NH3 gain of electrons FADH2 to FAD ,NAD+ to NADH, CH4 to CO2 ,Ag+ to Ag, CH3CHO to CH3CH2OH, CH3OH to CH4, N2H4 to N2