Carbonyl key words

Aldehyde

An aldehyde is a substance obtained by the oxidation of a primary alcohol containing the CHO group at the end of a hydrocarbon chain. 

Ketone

A class of organic compounds obtained by the oxidation of a secondary alcohol containing the carbonyl group CO attached to two alkyl groups such as CH3.

Primary Alcohol

any alcohol which possess the group CH2.OH, and can be oxidized so as to form a corresponding aldehyde having the same number of carbon atoms.