1. Alcohols contain an OH group.
  2. This usually makes them polar creating strong intramolecular hydrogen bonds so they have much higher melting and boiling points.
  3. A Primary Alcohol has the OH group at the end of the molecule.
  4. A Secondary Alcohol has the OH chain as a branch. The carbons either side are often referred to as R for Rest.
  5. A Tertiary Alcohol is a secondary alcohol which has another group attached to the same carbon as the OH.