investigating liquids

A liquid contains normally no ions or metals; so that you already know.
Many liquids belong to the carbon chemistry (organic chemistry: ethers, esthers, amino acids, alkanoles, etc.).
Of course there are also a number of inorganic liquids like water, bromium, sulfuric acid. To be sure if the substance is organic, you know how to find out (see IIa).
  1. Organic liquids do also produce carbon dioxyde and water (when burnt or investigated with lime water and waterfree Copper(II)sulfate
  2. Alkanals can be found with Fehlings Reactant
  3. Primary and secundary alkanols are found with dichromate or permanganate
  4. Unsaturated compounds with bromium water