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JAMB Chemistry 1998 Question 47

Question 47

Hydrocarbons

On cracking medicinal paraffin, a gas is evolved which gives a pop sound with a lighted splinter and an oily liquid which decolourizes bromine solution is also obtained. The products of the cracking are

  1. A.carbon (IV) oxide and alkyne
  2. B.carbon (II) oxide and alkene
  3. C.hydrogen gas and alkene
  4. D.hydrogen gas and alkane
Show the answer and explanation

Answer: C (hydrogen gas and alkene)

Explanation

A gas that burns with a pop is hydrogen. A liquid that decolourizes bromine is unsaturated, an alkene.