Identify the product formed when glucose is treated with dil. HNO_3...

Glucose on oxidation with dilute nitric acid ($\text{HNO}_3$) yields a dicarboxylic acid known as saccharic acid.

Dilute $\text{HNO}_3$ is a strong oxidizing agent that oxidizes both the terminal aldehyde group ($-\text{CHO}$) and the terminal primary alcohol group ($-\text{CH}_2\text{OH}$) of glucose into carboxylic acid groups ($-\text{COOH}$).

$\text{CHO}-(\text{CHOH})_4-\text{CH}_2\text{OH} \xrightarrow{\text{dil. HNO}_3} \text{COOH}-(\text{CHOH})_4-\text{COOH}$

Thus, the product formed is saccharic acid.

Answer: Saccharic acid