Why is electrolysis necessary for extracting some reactive metals from their molten compounds?

Electrolysis is necessary for extracting reactive metals because these metals cannot be reduced by carbon or other reducing agents due to their high reactivity. Instead, electrolysis allows for the direct separation of the metal from its compound by using electrical energy to drive the reaction.

This answer demonstrates an understanding of the limitations of traditional extraction methods for reactive metals and highlights the role of electrolysis in overcoming these challenges. The question tests the student's ability to explain a key concept in metal extraction.