The alkaline `CuSO_(4)` contanining sodium potassiumtartrate does not react with

The alkaline CuSO_(4) containing sodium potassium tartrate does not react with

Equal amount of aqueous solution of CuSO_4 and alkaline sodium potassium tartarate is mixed and treated with aliphatic aldehyde, then

Metallic sodium does not react normally with :

Fehlings solution is a mixture of CuSO_(4)(A) and an alkaline solution of sodium potassium tartrate (B), providing Cu^(2+) & OH^(-) . The role of sodium Potassium tartrate is (1) Provides OH- (2) Provides H+ (3) Complexing agent (4) All of these

How does phenol react with: Sodium