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JAMB Chemistry 2000 Question 45

Question 45

Alkanols

The conditions necessary for the extraction of a water molecule from two molecules of ethanol are

  1. A.less acid and a lower temperature
  2. B.excess acid and a lower temperature
  3. C.excess acid and a higher temperature
  4. D.less acid and a higher temperature
Show the answer and explanation

Answer: A (less acid and a lower temperature)

Explanation

Removing one water molecule from two ethanol molecules gives ethoxyethane (ether); this needs excess ethanol (less acid) at a lower temperature (about 140°C). Excess acid at 170°C gives ethene.