Question

sugar which cannot convert Cu2+ and Cu+ ions
1) Maltose
2) Lactose
3) Sucrose
4) Glucose

Answer 1

Answer:

Lactose

hope that helps uhh!!!

Answer 2

The correct solution is option c, Sucrose.

• Sucrose is a non-reducing disaccharide absent of free ketone and aldehyde groups.
• Sucrose therefore cannot reduce copper ( II ) ions into copper ( I ) ions.
• Benedicts's test is the test used for the determination of simple carbohydrates.
• When a carbohydrate-containing solution is heated with Benedict's reagent, it turns the solution into brickish red/orange in colour.
• The reducing sugars can only show the colour change. The copper( II ) ions in the benedict's solution are reduced to copper( I ) ions by the free ketone or aldehyde group present in the sugar. eg. Glucose, Fructose etc.
• Sucrose thus does not give positive results for Benedict's solution and remain blue in colour.
• Benedict's solution is an alkaline solution, deep blue in colour that consists of anhydrous sodium carbonate, sodium citrate and copper (II) sulfate pentahydrate.