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JAMB Chemistry 1979 Question 39

Question 39

Hydrocarbons

Hydrogenation may be effected by

  1. A.the removal of hydrogen from an alkane in the presence of a catalyst
  2. B.the addition of hydrogen to an alkane in the presence of a catalyst
  3. C.the addition of hydrogen to an alkyne
  4. D.the removal of hydrogen from an alkyne
  5. E.the addition of hydrogen to an ethyl alcohol.
Show the answer and explanation

Answer: C (the addition of hydrogen to an alkyne)

Explanation

Hydrogenation is adding hydrogen to an unsaturated compound such as an alkyne or alkene. Alkanes are saturated and cannot take up more hydrogen.