Aqueous solution of carbohydrate with 2 drops | vedclass

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(C) The test described is the $Molisch$ test,which is a sensitive chemical test for the presence of carbohydrates.When an aqueous solution of a carboh

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Violet

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(C) The test described is the $Molisch$ test,which is a sensitive chemical test for the presence of carbohydrates.When an aqueous solution of a carbohydrate is treated with an alcoholic solution of $\alpha$-naphthol followed by the addition of concentrated $H_{2}SO_{4}$ along the sides of the test tube,a purple or violet-coloured ring is formed at the junction of the two layers.This reaction occurs because the acid dehydrates the carbohydrate to form furfural or its derivatives,which then react with $\alpha$-naphthol to produce the characteristic violet-coloured complex.

Aqueous solution of carbohydrate with $2$ drops of alcoholic solution of $\alpha$-naphthol and $H_{2}SO_{4}$ gives a ring at the junction. The colour of the ring is:

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