Two-organic substances are labelled K and L if K gave a blue-black colour with iodine...

WAEC 2000

Two-organic substances are labelled K and L if K gave a blue-black colour with iodine solution and L gave a deep red precipitate with Million's reagent, it can be concluded that

A. K is a carbohydrate and L is a protein
B. K is alkaline and L is acidic
C. K is unsaturated and L is a reducing sugar
D. K is a reducing agent and L is an amino acid

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Correct Answer: Option A

Explanation

Substance K can be said to be Carbohydrate because starch (carbohydrate) when reacted with iodine, gives a blue-black colour while Protein (substance L) reacts with a Million's reagent to give a deep-red ppt. Hence, the correct answer is A

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