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LiAlH₄

NaBH₄, H₃O⁺

HCl, Zn $-$ Hg

Alkaline KMnO₄, H⁺

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Step-by-Step Explanation Step 1: Identify the Required Transformation The reaction indicated (from the image) involves an oxidation process. We observe that a strong oxidizing agent is needed to convert the organic reactant into the desired product (often a carboxylic acid or further oxidized derivative). Hence, we look for a reagent that can effectively perform vigorous oxidation. Step 2: Assess the Given Reagents LiAlH4: This is a powerful reducing agent, not suitable for oxidation. It typically reduces carbonyl compounds to alcohols. NaBH4, H3O+: This reagent is also used primarily for the reduction of aldehydes and ketones to alcohols, hence not suitable for an oxidation reaction. HCl, Zn-Hg (Clemensen Reduction): This set of reagents is used to reduce a carbonyl group (especially ketones or aldehydes) to a methylene (–CH2–) group. It does not oxidize but rather carries out a reduction. Alkaline KMnO4, H+: Potassium permanganate in alkaline solution followed by acidification is a strong oxidizing agent that can oxidize both aliphatic and benzylic groups to carboxylic acids or other higher oxidation state functionalities. Among these, only KMnO4 in an alkaline medium followed by acidic workup is well known for its strong oxidation capability. Step 3: Conclusion Since the required transformation clearly needs a robust oxidation, Alkaline KMnO4, H+ is the appropriate reagent. This reagent can fully oxidize side-chains or susceptible functional groups to the final oxidized product.

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