Question

What is the action of the following on propanal : Fehling solution /Tollen reagent?

Answer 1

Hey dear,


◆ Chemical tests of Propanal -
- As propanal is an aldehyde, it reduces both Tolllen's as well as Fehling's reagent.

a) Propanal reduces Fehling's reagent to a red brown precipitate of Cu2O.

CH3-CH2-CHO + 2 Cu2+ + 5 OH- ---> CH3-COO- + Cu2O + 3 H2O

b) Propanal reduces Tollen's reagent to a silver precipitate of Ag.

CH3-CH2-CHO + 2 [Na(NH3)2]+ + 3 OH- ---> CH3-CH2-COO- + Ag + 4 NH3 + 2 H2O

Hope this helps...