Invert sugar refers to an equimolar mixture of:

$\alpha-D-(+)-$Glucose and $\beta-D-(+)-$Glucose are not

Glucose cannot be classified as which of the following?

Glucose molecule reacts with $X$ number of molecules of phenylhydrazine to yield osazone. The value of $X$ is

$D$-Glucose and $L$-Glucose are

$L$-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 ....