A sugar 'X' dehydrates very slowly under acid | vedclass

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(A) The reaction described is the basis of the Bial's test or a variation of Seliwanoff's test conditions. Aldopentoses,when heated with concentrated

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Aldopentose

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(A) The reaction described is the basis of the Bial's test or a variation of Seliwanoff's test conditions. Aldopentoses,when heated with concentrated acids (like $HCl$),undergo dehydration to form furfural. Furfural then reacts with resorcinol to produce a coloured condensation product. While ketoses react rapidly (Seliwanoff's test),aldopentoses react more slowly under these conditions to yield furfural derivatives. Therefore,the sugar '$X$' is an aldopentose.

$A$ sugar '$X$' dehydrates very slowly under acidic conditions to give furfural,which on further reaction with resorcinol gives a coloured product after some time. Sugar '$X$' is

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