INBDE (Integrated National Board Dental Examination) Practice Exam

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The compound in polymer that initiates the reaction is:

ethanol
hydroquinone
water
benzoyl peroxide

The correct answer is: benzoyl peroxide

In polymer chemistry, the compound that initiates the reaction is referred to as the initiator. Benzoyl peroxide is commonly used as an initiator in polymerization reactions, particularly in the formation of acrylic plastics. When benzoyl peroxide is heated, it decomposes to form free radicals which then initiate the polymerization process by reacting with monomers to form polymer chains. This makes benzoyl peroxide an effective initiator in various polymerization processes. Regarding the other options: A. Ethanol is a solvent commonly used in polymer reactions but is not typically used as an initiator. B. Hydroquinone is often used as a polymerization inhibitor rather than an initiator. C. Water is not typically used as an initiator in polymerization reactions.