Question

Give one chemical test to distinguish between the following pairs of compound:
Formic acid and Acetic acid.

Answer 1

Formic acid gives a silver mirror with tollen's reagent.
$\underset{formicacid}{HCOOH}+A{g}_{2}O\to H_{2}O+C{O}_2+\underset{silvermirror}{2Ag\downarrow }$
Acetic acid does not give this test.