Unknown Chemical solutions

We had 3 colourless solutions Q, R & S. We also had an orange coloured solution that was called reagent X. We had to carry out tests with Q, R & S with reagent X, then with Fehling’s solution and then finally with Sodium Hydrocarbonate. 

Here were the results I obtained:

Addtion of X:

Q – Orange/brown solution formed

R – Purple solution formed

S – Pale yellow solution formed

With Fehlings:

Q – Brick red ppt formed

R – Brick red ptt formed

S – No obseverable change

With Sodium Hydrocarbonate:

Q & R – No reaction

S – Gas evolved

I am looking for the identity of Q,R,S and reagent X

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