Identify the correct set of stereochemical relationships amongst the following monosaccharides $I-IV$
A$I$ and $II$ are anomers ; $III$ and $IV$ are epimers
B$I$ and $III$ are epimers ; $II$ and $IV$ are anomers
C$I$ and $II$ are epimers ; $III$ and $IV$ are anomers
D$I$ and $III$ are anomers ; $I$ and $II$ are epimers
Medium
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D$I$ and $III$ are anomers ; $I$ and $II$ are epimers
d $(d)$
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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
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