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  3. An organic compound is found to contain C, H and O as elements

. An organic compound is found to contain C, H and O as elements

It is soluble in water, chars with conc. sulphuric acid and also gives purple colour with Molisch reagent. The Fehling solution test is negative but it forms a blue colour with iodine. The organic compound should be

A. Glucose

B. Fructose

C. Starch

D. Meso-tartaric acid

 

 

Best Answer

Ans: C

Sol: Charring with conc.H2SO4 and purple colour with Molisch reagent shows it to be a carbohydrate. As Fehling solution test is negative, it could not be glucose and fructose. Since it gives blue colour with iodine, so it is starch which forms a blue starch-iodine complex.

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