The 'epimerisation' involves

Which of the following is a monosaccharide?

An example of a non-reducing sugar is:

$L$-isomer of a compound $A$ $(C_{4}H_{8}O_{4})$ gives a positive test with $[Ag(NH_{3})_{2}]^{+}$. Treatment of $A$ with acetic anhydride yields a triacetate derivative. Compound $A$ produces an optically active compound $B$ and an optically inactive compound $C$ on treatment with bromine water and $HNO_{3}$ respectively. Compound $A$ is ....

An organic compound gives a positive result for Molisch's test as well as Benedict's test,but it does not give a positive result for Seliwanoff's test. Most probably,it is:

$D(+)$-glucose reacts with hydroxylamine $(NH_2OH)$ and yields an oxime. The structure of the oxime would be: