FTP, name this resonance-derived lack of reactivity in many hydrocarbons, named for the odor arising from the first of said hydrocarbons.
The first molecules found to exhibit it were discovered in coal tar in the 1860s, and it is prevented by heavy angle or steric strain.  Despite the conjugation of their bonds, linear alkenes do not have this quality because they are not cyclic, and other criteria for it include planarity.  10-annulene has extraordinary stability due to it, although benzene may be the best-known compound displaying it.  FTP, name this resonance-derived lack of reactivity in many hydrocarbons, named for the odor arising from the first of said hydrocarbons.
The first molecules found to exhibit it were discovered in coal tar in the 1860s, and it is prevented by heavy angle or steric strain.  
aromaticity or aromatic