Which of the following gas can be polymerised to produce a polymer when exposed to vapours of iodine?

Correct option is D

Correct Answer: (d) Acetylene
Explanation:
· Acetylene (C₂H₂) can be polymerised to form polyacetylene when exposed to iodine vapours.
· Iodine acts as a dopant, initiating the polymerisation process and greatly increasing the electrical conductivity of the resulting polymer.
Information Booster:
· Polyacetylene is one of the earliest known conducting polymers.
· It becomes highly conductive when doped with iodine, which removes electrons and creates charge carriers.
· Polyacetylene played a major role in the development of conducting polymer research, earning a Nobel Prize in Chemistry (2000) for Heeger, MacDiarmid, and Shirakawa.