Aromatic hydrocarbons: benzene as example

Introduction

- occur in petroleum and coal

- many have unpleasant smell

- many of the aromatic vapours are toxic

Chemical properties of hexane, cyclohexene and methylbenzene

- table showing the comparison

- Combustion: The luminosity of the flame, and the amount of black soot produced when methylbenzene

  is burnt may be taken as an indication of relatively high carbon content or high C/H ratio in aromatic

  compounds.

- Reaction with Br2/CH3CCl3:The apparent unreactivity of methylbenzene with bromine in

  1,1,1-trichloroethane indicates the stability of benzene ring.

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