Case: Read the passage and answer the following questions

There are two broad types of polymerization reactions, i.e., the addition or chain growth polymerization and condensation or step growth polymerization. In the addition polymerization, the molecules of the same monomer or different monomers add together on a large scale to form a polymer. The monomers used are unsaturated compounds, e.g., alkenes, alkadienes and their derivatives. This mode of polymerization leads to an increase in chain length and chain growth can take place through the formation of either free radicals or ionic species while condensation polymerization generally involves a repetitive condensation reaction between two bi-functional or tri-functional monomeric units. These poly-condensation reactions may result in the loss of some simple molecules as water, alcohol, hydrogen chloride, etc. and lead to the formation of high molecular mass condensation polymers.
In these reactions, the product of each step is again a bi-functional species and the sequence of condensation goes on. Since, each step produces a distinct functionalized species and is independent of each other, this process is also called step growth polymerization.

Which of the following is used as an initiator in the polymerisation of ethene?

Benzoyl peroxide

The correct answer is option 2. Benzoyl peroxide.

Among the options provided, the initiator commonly used in the polymerization of ethene (ethylene) is "Benzoyl peroxide." Benzoyl peroxide is a widely used initiator in free radical polymerization reactions, including the polymerization of ethylene. In the presence of heat or other initiation methods, benzoyl peroxide decomposes to form free radicals, which initiate the polymerization process by reacting with ethylene molecules. This reaction leads to the formation of polyethylene, a common thermoplastic polymer.

So, the correct answer is Benzoyl peroxide