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Chemistry Question 69 – NEET-UG 2023

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Which amongst the following molecules on polymerization produces neoprene?

Neoprene is a synthetic rubber known for its resistance to oil, heat, and weathering.

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Ninja Strategy•Monomer Specificity

Recognize that neoprene is a specific synthetic rubber, and its formation requires a unique monomer, chloroprene, which is characterized by a chlorine substituent on a 1,3-butadiene backbone.

Step 1: Identify the Polymer and its Monomer✦ Active

Neoprene is a synthetic rubber. It is produced by the addition polymerization of its monomer, chloroprene.

Step 2: Determine the Chemical Structure of Chloroprene○ Expand

Chloroprene is the common name for 2-chloro-1,3-butadiene. This indicates a four-carbon chain with double bonds at positions 1 and 3, and a chlorine atom attached to the second carbon.

H2C=C(Cl)−CH=CH2
💡 Teacher's Secret Hint

Remember that 1,3-butadiene is the base structure for many synthetic rubbers, with different substituents leading to different polymers.

Step 3: Match the Structure with the Given Options○ Expand

Comparing the structure of 2-chloro-1,3-butadiene with the provided options:

Option (1) is 1,3-butadiene (monomer for Buna-S/N).

Option (2) is 2-chloro-1,3-butadiene (chloroprene).

Option (3) contains a triple bond, which is incorrect.

Option (4) is 2-methyl-1,3-butadiene (isoprene, monomer for natural rubber).

Thus, option (2) correctly represents the monomer of neoprene.

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