Lucy was found by Donald Johanson and Tom Gray on November 24, 1974, at the site of Hadar in Ethiopia. They had taken a Land Rover out that day to map in another locality. After a long, hot morning of mapping and surveying for fossils, they decided to head back to the vehicle.
Alkanes are an example of saturated compounds. An unsaturated compound is a chemical compound that contains carbon-carbon double bonds or triple bonds, such as those found in alkenes or alkynes, respectively. Saturated and unsaturated compounds need not consist only of a carbon atom chain.
Molecules with double and triple bonds are called unsaturated. Unsaturated molecules are more reactive Hydrocarbon molecules (II) Ethylene, C 2 H 4 Acetylene, C 2 H 2 H-Câ¡C-H Isomers are molecules that have the same composition (contain the same atoms) but have different atomic arrangement.