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this presentation include history chemical physical properties and uses of benzene..

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benzene

  1. 1. 1
  2. 2. 2
  3. 3. compounds
  4. 4. Made by: AYESHA AFTAB MALIKBs in bioinformaticsInternational Islamicuniversity IslamabadPakistan
  5. 5. Aromatic compounds: a hydrocarbon with alternating double an single bonds between carbon atoms containing one or more benzene rings that are characteristic of the benzene series of compounds.
  6. 6. Benzene and Aromatic Compounds Benzene (C6H6) is the simplest aromatic hydrocarbon (or arene). Benzene has four degrees of unsaturation, making it a highly unsaturated hydrocarbon. Whereas unsaturated hydrocarbons such as alkenes, alkynes and dienes readily undergo addition reactions, benzene does not. 6
  7. 7. History of aromatic compounds:  August Wilhelm Hofmann in 1855  August Kekulé in 1865
  8. 8.  J. J. Thomson, between 1897 and 1906 Sir Robert Robinson, in 1925
  9. 9.  Ernest Crocker in 1922 Hückel in 1931.
  10. 10.  Friedel–Crafts alkylation involves the alkylation of an aromatic ring with an alkyl halide using a strong Lewis acid catalyst. With anhydrous ferric chloride as a catalyst, the alkyl group attaches at the former site of the chloride ion
  11. 11.  any group derived from an alkane by the removal of one hydrogen atom. Alkyl groups are often designated by the symbol R.
  12. 12.  . Acylation means substituting an acyl group into something - in this case, into a benzene ring. The most commonly used acyl group is CH3CO-. This is called the ethanoyl group
  13. 13. An acyl group is an alkyl group attached to a carbon-oxygen double bond. If "R" represents any alkyl group, then an acyl group has the formula RCO-
  14. 14.  They consist of three or more benzene rings commonly produced by fossil fuel combustion. Also called polynuclear aromatic hydrocarbon.
  15. 15.  Cigarettes Styrofoam(use mostly in food containers) Cumene (paint thinner, lacquer thinner, brush cleaner, paint stripper and spray paint) Benzene in Soft Drinks Gasoline
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this presentation include history chemical physical properties and uses of benzene..

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