Reduction of Acetaldehyde will give Ethanol. The H2 adds C=O.
The reaction can be catalyzed by transition metals. Various other
reagents can also suffice reduction like Hydrides.
Oxidation of secondary alcohol leads to the formation of Ketone
under normal non-vigorous conditions. 5-Methyl-3-hexanol on
oxidation with chromates, MnO2, PCC like reagents will give
5-Methylhexan-3-one.
Reduction of 4-Methyl-2-hexanone gives 4-Methylhexan-2-ol.
Reduction of 3-Methylcyclopentanone gives
3-Methylcyclopentnol.