Sugar which does not give reddish brown precipitate with Fehling's reagent is:
A
Sucrose
B
Lactose
C
Glucose
D
Maltose
JEE MAIN 2024, Difficult
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A
Sucrose
a Sucrose do not contain hemiacetal group.
Hence it does not give test with Fehling solution.
While all other give positive test with Fehling solut
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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 $sp^2$