WAEC Chemistry 2011 Objective — Question 46

Question 46 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

The reagent that can be used to distinguish ethene from ethyne is

A. A. ammoniacal silver trioxonitrate (V) solutionCorrect
B. B. Benedict solution
C. C. bromine water
D. D. Fehling's solution

Explanation

Ammoniacal AgNO3, ammoniacal CuCl and sodium in liquid NH3 can distinguish terminal alkynes (like ethyne) from other organic compounds such as ethene, since terminal alkynes have a triple bond at the extreme end.

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