The correct statement(s) regarding sugars is(are) Given: Specific...

Statement (A) is incorrect: Nitric acid ($\text{HNO}_3$) is a strong oxidizing agent that oxidizes both glucose and gluconic acid to saccharic acid.

Statement (B) is correct: Fehling's reagent provides an alkaline medium. Under these conditions, fructose (a ketose) undergoes the Lobry de Bruyn-van Ekenstein rearrangement to form an equilibrium mixture of fructose, glucose, and mannose. Glucose and mannose are aldohexoses that readily reduce Fehling's solution, giving a positive test.

Statement (C) is correct: Hydrolysis of sucrose (a disaccharide) yields an equimolar mixture of D-($+$)-glucose and D-($-$)-fructose. This mixture is known as invert sugar because the sign of specific rotation changes from positive (for sucrose) to negative (for the mixture).

Statement (D) is incorrect: The specific rotation of L-($-$)-glucose is $-52.5^\circ$, so for D-($+$)-glucose it is $+52.5^\circ$. The specific rotation of L-($+$)-fructose is $+92.5^\circ$, so for D-($-$)-fructose it is $-92.5^\circ$.
The specific rotation of invert sugar (an equimolar mixture of D-glucose and D-fructose, which have the same molar mass) is the average of their specific rotations:
$[\alpha]_{\text{mix}} = \dfrac{+52.5^\circ + (-92.5^\circ)}{2} = -20^\circ$.

Answer: Fructose gives a positive Fehling's test because it isomerises to glucose and another aldohexose in the presence of Fehling's reagent.; Invert sugar is an equimolar mixture of D-glucose and D-fructose formed after hydrolysis of the corresponding disaccharide.