Identify the non-reducing sugar.

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 hybridization of $C_2$ changes from $sp^3$ to $sp^2$.

The pentose sugar in $DNA$ and $RNA$ has a ......... structure.

Which of the following statements is $NOT$ correct?

Match List-$I$ with List-$II$:

List-$I$ (Reaction of glucose with)	List-$II$ (Product formed)
$A$. Hydroxylamine	$I$. Gluconic acid
$B$. $Br_2$ water	$II$. Glucose pentaacetate
$C$. Excess acetic anhydride	$III$. Saccharic acid
$D$. Concentrated $HNO_3$	$IV$. Glucoxime

Choose the correct answer from the options given below:

The specific rotations of $\alpha-$ and $\beta-$ glucose are different. When either is dissolved in water,their rotation changes until a constant value is reached. This phenomenon is called ......