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JAMB Chemistry 2008 Question 48

Question 48

Hydrocarbons

The product obtained when a mixture of benzene vapour and hydrogen are passed over a nickel catalyst at 180°C is

  1. A.cyclohexane
  2. B.cyclopentane
  3. C.n-hexane
  4. D.n-pentane.
Show the answer and explanation

Answer: A (cyclohexane)

Explanation

Benzene adds three molecules of hydrogen across its ring: C6H6 + 3H2 → C6H12 (cyclohexane). The ring stays intact.