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JAMB Chemistry 2005 Question 13

Question 13

Hydrocarbons

The decolourization of the purple colour of tetraoxomanganate (VII) ion is a test for

  1. A.alkenes
  2. B.alkanols
  3. C.alkanals
  4. D.alkanes
Show the answer and explanation

Answer: A (alkenes)

Explanation

Alkenes have a C=C double bond which is oxidised by acidified KMnO4, so the purple colour disappears; this is the standard test for unsaturation.