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JAMB Chemistry 2010 Question 48

Question 48

Hydrocarbons

The haloalkanes used in the dry-cleaning industries are

  1. A.trichloromethane and tetrachloromethane
  2. B.chloroethene and dichloroethene
  3. C.trichoroethene and tetrachloroethene
  4. D.chloroethane and dichloroethene
Show the answer and explanation

Answer: A (trichloromethane and tetrachloromethane)

Explanation

Chlorinated solvents dissolve grease without water. Of the options, only trichloromethane (CHCl3) and tetrachloromethane (CCl4) are haloalkanes, and CCl4 was a classic dry-cleaning solvent; the others are haloalkenes or not used for this.