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Formic acid reduces Tollen's reagent, but acetic acid does not-Give reasons. |
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Answer» Solution :(i) Formic acid (HCOOH) is unique because it contains both an aldehyde group and carboxyl group also. (ii) Hence it can act as a reducing agent. It REDUCES Fehling's solution Tollen's reagent and decolourises pink coloured `KMnO_(4)` solution. (iii) Whereas in acetic acid, there is no aldehyde group and it cannot act as reducing agent. (iv) Formic acid reduces ammoniacal SILVER nitrate solution (Tollen's reagent) to metallic silver. `HCOOH+Ag_(2)OtoH_(2)O+CO_(2)+2Agdarr` (metallic silver) (v) Formic acid reduces Fehling's solution. It reduces BLUE coloured cupric ions to red coloured cuprous ions. `HCOO^(-)+underset("(blue)")(2CU^(2+))+5OH^(-)toCO_(3)^(2-)+underset("(red)")(Cu_(2)O)+3H_(2)O` |
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