Lipids are non-polar (hydrophobic) compounds, soluble in organic solvents. Fatty acids consist of a hydrocarbon chain with a carboxylic acid at one end. CH 3(CH 2 ) n-COONon-polar polarLipids are non-polar (hydrophobic) compounds, soluble in organic solvents. Fatty acids consist of a hydrocarbon chain with a carboxylic acid at one end. CH 3(CH 2 ) n-COONon-polar polar