Van Arkel method of purification of metals involves converting the metal to a :

Explanation

The Van Arkel method, also known as the iodide process, is a purification technique used for certain reactive metals like titanium and zirconium. It involves converting the metal to a volatile stable compound, which is then decomposed to obtain purified metal. The compound formed must be volatile and stable under reaction conditions to facilitate purification. In the case of titanium, it reacts with iodine to form titanium tetraiodide, a volatile stable compound that can be decomposed to yield purified titanium and iodine gas.Therefore, the correct answer is Option A) Volatile stable compound, as it aligns with the essential characteristics required for the Van Arkel purification method. Options B, C, and D are incorrect as they do not fulfill the specific requirements of the purification process.