Monomer of polypropene/polypropylene is:A. propaneB. propeneC. propyneD. prop-1,2-diene

To determine the monomer of polypropene (also known as polypropylene), let's analyze the options given.

Polypropylene:
Polypropylene is a type of polymer made from the monomer propene.

Analysis of the Options:
A. Propane:

Propane is an alkane (C₃H₈) and does not contain a double bond. It cannot polymerize to form polypropylene because it lacks the necessary unsaturation required for addition polymerization.
B. Propene:

Propene (C₃H₆) is an alkene that contains a carbon-carbon double bond. This double bond allows for the addition reaction necessary for polymerization, where multiple propene molecules can join together to form polypropylene.
C. Propyne:

Propyne (C₃H₄) is an alkyne and also contains a triple bond. Like propane, it cannot form polypropylene because it does not have the appropriate structure for the addition polymerization needed.
D. Prop-1,2-diene:

Prop-1,2-diene (C₃H₄) contains two double bonds. While it can undergo polymerization, it forms a different type of polymer, not polypropylene.
Conclusion:
The correct answer is B. Propene.

Explanation of Polymerization:
In the process of polymerization, propene molecules undergo a reaction where the double bond between carbon atoms opens up, allowing the molecules to link together in long chains. This reaction results in the formation of polypropylene, which has many applications in various industries due to its strength, flexibility, and resistance to chemicals.