Benzoyl peroxide is the initiator that can be used for free radical chain-growth polymerization. Hence, option A is the correct answer.
A polymerization reaction is a reaction in which small molecules called monomers, combine with large and complex molecules to form a polymer. Initiators are substances that link to these monomers and form an intermediate compound such that it becomes capable of getting linked with other monomers to form a long chain.
Free radical polymerization involves three steps, they are chain initiation, chain propagation, and chain termination. The first step i.e. chain initiation step is where the formation of a free radical from the initiator takes place. The second step i.e. chain propagation where the addition of the formed free radical to the unsaturated alkene or diene monomer to form another free radical with a longer chain takes place. This process is repeated multiple times to form a long polymerized product.
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