The correct statements about lipids are:
(1) Lipids having only single bonds are called saturated fatty acids, while those having single, double and triple bonds are called unsaturated fatty acids.
(2) Lecithin is a phospholipid.
(3) Trihydroxy propane or Propane−1,23-triol is glycerol.
(4) Palmitic acid has 16 carbon atoms including carboxyl carbon.
(5) Arachidonic acid has 20 carbon atoms including carboxyl carbon.