Sulphur is to Vulcanisation as Chlorine is to......? ExtractionAllotropy BleachingMetallurgy

In this analogy, "Sulphur is to Vulcanisation" indicates a relationship where sulphur is used in the process of vulcanisation (rubber hardening). Similarly, we need to identify the role of chlorine in the given options: Extraction, Allotropy, Bleaching, and Metallurgy.

• Sulphur and Vulcanisation: Sulphur is primarily used in the process of vulcanisation to improve the properties of rubber.

• Chlorine: Chlorine is primarily associated with the process of bleaching, where it is used to whiten or remove color from materials.

Thus, the correct analogy is:

Chlorine is to Bleaching.