Explain five observations which suggest that benzene should not be classed with the alkenes, however rather as a member of a separate class of "aromatic" compound, although the fact that its formula is often shown with three double bonds. In each case contrast the observation for benzene with that for an alkene (not a specificalkene). Be careful with the word observation. It explains something that can be measured or appreciated directly or indirectly by the senses rather than the intellect.