Question

Fehling’s solution ‘A’ is

• A. aqueous copper sulphate
• B. alkaline copper sulphate
• C. alkaline solution of sodium potassium tartrate (Rochelle’s salt)
• D. aqueous sodium citrate

Answer 1

The Correct Option is A

Fehling's solution is employed in chemical analyses to distinguish between water-soluble aldehyde and ketone functional groups. It typically comprises two distinct solutions, mixed equally just prior to testing.

Fehling's solution ‘A’ is specifically an aqueous solution of copper(II) sulphate, a key component that, when combined with solution ‘B’, forms Fehling's reagent.

Component	Description
Fehling’s solution 'A'	Aqueous copper sulphate
Fehling’s solution 'B'	Alkaline solution containing sodium potassium tartrate (Rochelle's salt)

Upon combination, these solutions generate a complex. When heated with an aldehyde, this complex causes a red precipitate to form, resulting from the reduction of copper(II) ions to copper(I) oxide.