Benedict's Test Shows Increasing Response with Reducing Sugar Concentration

Steps:

• Benedict's test detects reducing sugars like α-glucose by reducing Cu²⁺ to red Cu₂O precipitate.
• Higher glucose concentration provides more reducing agents, producing more precipitate.
• Test results are measured by color intensity or precipitate amount, which correlates directly with concentration.
• Correct graph plots increasing response (e.g., absorbance) against rising glucose concentration.

Why A is correct:

• It depicts a linear or proportional increase in color intensity with glucose concentration, matching the direct relationship in the redox reaction where moles of Cu₂O formed equal moles of glucose oxidized.

Why the others are wrong:

• B shows decreasing response, contradicting the positive correlation with concentration.
• C exhibits a plateau or non-linear drop-off, ignoring ongoing reduction at higher levels.
• D inverts the trend, suggesting negative correlation absent in Benedict's chemistry.

Final answer: A