Benedict's Test Identifies Reducing Sugars Like Glucose

Steps:

• Glucose is a reducing sugar that reacts with Benedict's reagent, changing color from blue to green/yellow/orange/red precipitate.
• Review the table: Solution 1 remains blue (negative for reducing sugars); Solution 2 turns green/orange (positive); Solution 3 turns brick-red (positive).
• Eliminate non-reducing sugars or negatives: Solution 1 lacks color change, so no glucose.
• Confirm positives: Solutions 2 and 3 match glucose reaction, indicating presence before testing.

Why D is correct:

• D selects solutions 2 and 3, which show Benedict's positive color changes diagnostic for reducing sugars like glucose.

Why the others are wrong:

• A includes solution 1, which has no color change and thus no glucose.
• B omits solution 3, which shows a positive test for glucose.
• C omits solution 2, which shows a positive test for glucose.

Final answer: D