The number of $sp^2$ hybridised carbons present in "Aspartame" is
A$7$
B$8$
C$9$
D$5$
JEE MAIN 2020, Difficult
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C$9$
c
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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 $sp^2$