1.

Formic acid act as reducing agent. Prove this statement.

Answer»

Solution : (i) Formic ACID contains both an aldehyde as well as an acid group. Hence, like other aldehydes, formic acid can easily be oxidised and THEREFORE acts as a strong reducing agent.

(ii) Formic acid reduces Tollen.s reagent ( ammonical SILVER nitrate solution ) to metallic silver .
`HCOO^(-) + UNDERSET("(Tollen.s reagent)")(2Ag^(+)) + 3OH^(-) to underset("Silver mirror")(2Ag) + CO_(3)^(2-) + 2H_2O`
(ii) Formic acidreduces Fehling.s solution . It reduces blue coloured cupric IONS to red coloured cuprous ions .
`HCOO^(-) + underset("(Fehling solution) ( Blue)")(2Cu^(2+))+5OH^(-) to underset("Red precipitate")(Cu_2O darr) + CO_(3)^(2-) + 3H_2O`


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