A sugar ' $X$ ' dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol gives the coloured product after sometime. Sugar ' $X$ ' is
A
Aldopentose
B
Aldotetrose
C
Oxalic\,acid
D
Ketotetrose
JEE MAIN 2022, Medium
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A
Aldopentose
a
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Assertion : Treatment of $D-$ glucose with dilute alkali affords an equilibrium mixture consisting of $D-$ mannose, $D-$ fructose and starting substance $D-$ glucose.
Reason : The reaction involves an intermediate in which hybridisation of $C_2$ changes from $sp^3$ to $sp^2$