Write the equations of any aldehyde with Fehling's reagent.

Fehling's
reagent is a mixture of two solutions Fehling solution A and Fehling solution B, Fehling solution A is aqueous copper sulphate and sodium, potassium tartarate (Rochelle salt). These two solutions are mixed in equal amounts to form Fehling's reagent.On heating an aldehyde with Fehling's reagent, a reddish brown precipitate is obtained Aldehyde is oxidised to corresponding carboxylate ion.
$\mathrm{R}-\mathrm{CHO}+2{\mathrm{Cu}}^{+2}+5{\mathrm{OH}}^{-}\stackrel{ }{\to } \mathrm{R}-{\mathrm{COO}}^{-}+{\mathrm{Cu}}_2\mathrm{O}\downarrow +3{\mathrm{H}}_2\mathrm{O}$