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JAMB Chemistry 2006 Question 20

Question 20

Alkanoic Acids and Esters

Which of the following functional groups will give gas bubbles when treated with a saturated solution of sodium hydrogen trioxocarbonate(IV)?

  1. A.—NH2
  2. B.—COOH (—C(=O)—OH)
  3. C.— OH
  4. D.>C=O
Show the answer and explanation

Answer: B (—COOH (—C(=O)—OH))

Explanation

Carboxylic acids are strong enough to react with NaHCO3, releasing bubbles of CO2. Amines, alcohols and carbonyl compounds do not.