First slide

Glucose

Question

Presence of primary alcohol group in glucose is indicated by its reaction with – ‘X’. Presence of aldehyde group in glucose is indicated by its reaction with ‘Y’. ‘X’ & ‘Y’ respectively are

Moderate

A

$Conc . {HNO}_{3}; {Br}_{2} / H_{2} O$
B

$Dil . {HNO}_{3}; {[Ag {({NH}_{3})}_{2}]}^{+}$
C

$Dil . {HNO}_{3}; HCN$
D

$Conc . {HNO}_{3}; {NaHSO}_{3}$

Solution

$Conc . {HNO}_{3}$ … strong oxidant – not only oxidizes $- CHO gp$ to $- COOH$ but also oxidizes $- {CH}_{2} OH -$ group also to $- COOH$ group;
${Br}_{2} / H_{2} O$ , Tollen’s, Fehling’s, Benedict’s .. mild oxidants.. oxidizes $- CHO$ group only to $- COOH$ group

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