Question

Identify the reagent(s) ‘A’ and condition(s) for the reaction:

• A. A = HCl; Anhydrous AlCl₃
• B. A = HCl, ZnCl₂
• C. A = Cl₂, dark, Anhydrous AlCl₃
• D. A = Cl₂; UV Light

Answer 1

The correct option is D

A = Cl₂; UV Light

Explanation for the correct option:

Option D: Reagent: A reagent is known as a substance or compound which is added to a system to cause a chemical reaction.

Identification of Reagent and Condition in the given question:

• In the initiation phase, free radicals are generated and the given reaction is the initiation phase which produces two chlorine-free radicals.
• The quanta of UV light or 'photodissociation' is used to break the bonds between chlorine atoms.
• Therefore the A is a reagent that is Cl₂, because UV light and the given condition for the reaction are identified as the free radical substitution reaction.

• For substitution at the allylic position in the given compound, the reagent used is Cl2 /uv light. The reaction is free radical halogenation.

Final Answer: Hence, the correct option is (D).