WAEC Chemistry 2011 Theory — Question 19
Question 19 of 31 from the West African Examinations Council (WAEC) Chemistry 2011 Theory paper, with the correct answer and a full explanation.
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4e Consider the given unsaturated hydroxy-acid structure. (i) State what would be observed when the compound is treated with each of the following reagents: I. cold NaHCO3(aq); II. hot solution of I2 in NaOH(aq); III. bromine water. (ii) State the functional group responsible for the observations in (i) above.
Model answer
(i) I. Effervescence of CO2 is observed. II. A yellow precipitate is formed. III. The bromine water is decolorized. (ii) I. Carboxylic group (-COOH) - a group oxidizable to methylcarbonyl group. III. The double carbon-to-carbon bond (C=C) is responsible for decolorizing bromine water.
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