Which of the following is not present in nucleic acids
A
Uracil
B$2$ - aminopyridine
C
Thymine
D
Adenine
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B$2$ - aminopyridine
b $2-$aminopyridine is not present in nucleic acid and as cytosine, Adenine, Thymine and $GUANINE$ are the four main bases found in nucleic acid. Adenine and Guanine are purines while thymine and cytosine are pyrimidines. They together form triple bonded histones of $DNA$.$2-$Aminopyridine is an organic compound with the formula $H _2 NC _5 H _4 N$. It is one of three isomeric aminopyridines
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It is best to carry out reactions with sugars in neutral or acid medium and not in alkaline medium. This is because in alkaline medium sugars undergo one of the following changes
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 $sp^2$