Identify the reagent(s) 'A' and condition(s) for the reaction
Identify the reagent(s) 'A' and condition(s) for the reaction
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- A = HCl, \(\mathrm{ZnCl_2}\)
- A = HCl; Anhydrous \(\mathrm{AlCl_3}\)
- A = \(\mathrm{Cl_2}\); UV light
- A = \(\mathrm{Cl_2}\); dark, Anhydrous \(\mathrm{AlCl_3}\)
The Correct Option is C
Solution and Explanation
Substitution of allylic hydrogens occurs through a free-radical chain mechanism, which needs \(\mathrm{Cl_2}\) with UV light (or heat).
HCl/\(\mathrm{ZnCl_2}\) (Lucas reagent) converts alcohols to chlorides, HCl would add across the C=C, and \(\mathrm{Cl_2}\)/\(\mathrm{AlCl_3}\) in the dark is the ionic electrophilic path (aromatic substitution or addition), not allylic substitution.
Answer: (3) A = \(\mathrm{Cl_2}\); UV light
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