Now first let’s take a look to what diene means, ‘DIENE’ is a molecule containing 2 carbon-carbon double bonds. So now when we look into the preparation of each of the above options we need to search for carbon-carbon double bond.

Preparation of Dacron:

Preparation of Buna-S:

Preparation of Neoprene:

Preparation of Novolac: Option ii and iii, with Buna-S and Neoprene is the answer for the above question.

Explanation: Now first let’s take a look to what diene means, ‘DIENE’ is a molecule containing 2 carbon-carbon double bonds. So now when we look into the preparation of each of the above options we need to search for carbon-carbon double bond.

Preparation of Dacron:

Preparation of Buna-S:

Preparation of Neoprene:

Preparation of Novolac:

Now when we observe the above reactions we find carbon carbon double bond only in Buna-S and neoprene, meaning that they have diene monomer for their preparation.

Now when we observe the above reactions we find carbon carbon double bond only in Buna-S and neoprene, meaning that they have diene monomer for their preparation.