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 used in chemical tests to differentiate between water-soluble aldehydes and ketone functional groups. It is typically composed of two separate solutions which are mixed in equal parts just before the test.

Fehling's solution ‘A’ specifically refers to an aqueous solution of copper(II) sulphate. It is one of the critical components that combine with solution ‘B’ to form 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)

When combined, these solutions create a complex that, upon heating with an aldehyde, leads to a red precipitate being formed due to the reduction of copper(II) ions to copper(I) oxide.