JAMB Chemistry 1994 Question 50

Question 50

Hydrocarbons

Which of the following reagents will confirm the presence of unsaturation in a compound?

  1. A.Fehling's solution
  2. B.Bromine water
  3. C.Tollen's reagent
  4. D.Benedict's solution
Show the answer and explanation

Answer: B (Bromine water)

Explanation

Bromine water adds across C=C or C≡C bonds and loses its red-brown colour quickly. The other three reagents test for aldehydes or reducing sugars.