The decreasing order of reactivity of the following organic molecules towards AgNO₃ solution is :

The IUPAC name of the following compound is :

Among statements (a) - (d), the correct ones are
(a) Lime stone is decomposed to CaO during the extraction of iron from its oxides.
(b) In the extraction of silver, silver is extracted as an anionic complex.
(c) Nickel is purified by Mond’s process.
(d) Zr and Ti are purified by Van Arkel method.

On combustion of Li, Na and K in excess of air, the major oxides formed, respectively, are :