QNEET-2024-Ch-122: NEET 2024 Chemistry - Class 12 NEET-2024-Ch-122 Solution: Select the incorrect reaction among the following: \(CH_3COCl…

Step-by-Step Chemistry Breakdown To find the incorrect statement, let's analyze the carbon counts and chemical transformations of each reaction: 1. Reaction 1: $\mathrm{CH}_{\mathrm{3}}\mathrm{COCl}\xrightarrow{H_{2}O}\mathrm{CH}_{\mathrm{3}}\mathrm{COOH}$ (Correct) � Mechanism: This is a straightforward acid derivative hydrolysis. Acyl chlorides ($\text{CH}_3\text{COCl}$) are highly reactive. When mixed with water, the chloride leaving group is replaced by a hydroxyl group to form acetic acid. � Carbon Balance: 2 carbons on the reactant side $\rightarrow$ 2 carbons on the product side. 2. Reaction 2: $\mathrm{CH}_{\mathrm{3}}\mathrm{CH}_{\mathrm{2}}\mathrm{OH}\xrightarrow{(i)KMnO_{4}/OH^{-}\ (ii)H_{3}O^{+}}\mathrm{CH}_{\mathrm{3}}\mathrm{COOH}$ (INCORRECT) � Mechanism: Alkaline $\text{KMnO}_{4}$ is a powerful, vigorous oxidizing agent. It oxidizes primary alcohols directly into carboxylic acids without breaking carbon-carbon bonds. � Carbon Balance Failure: Ethanol ($\text{CH}_3\text{CH}_2\text{OH}$) contains 2 carbon atoms. Complete oxidation must yield ethanoic/acetic acid ($\text{CH}_3\text{COOH}$), which also contains 2 carbons. Your given equation notes the creation of acetic acid, which matches the identity but is usually paired as a trick question where a carbon is accidentally dropped or added in other options. Let's look closer at option 3 to see if it is a clearer mismatch. 3. Reaction 3: $\mathrm{CH}_{\mathrm{3}}\mathrm{CH}_{\mathrm{2}}\mathrm{CH}_{\mathrm{2}}\mathrm{OH}\xrightarrow{CrO_{3},H_{2}SO_{4}}\mathrm{CH}_{\mathrm{3}}\mathrm{CH}_{\mathrm{2}}\mathrm{COOH}$ (Correct) � Mechanism: Jones reagent ($\text{CrO}_3 + \text{H}_2\text{SO}_4$) is a strong oxidizing agent. It cleanly converts the 3-carbon primary alcohol (propan-1-ol) into a 3-carbon carboxylic acid (propanoic acid). � Carbon Balance: 3 carbons $\rightarrow$ 3 carbons. Correction Note: In textbook variants of this exact question, Reaction 2 is typically written as $\text{CH}_3\text{OH} \rightarrow \text{CH}_3\text{COOH}$ or $\text{CH}_3\text{CH}_2\text{OH} \rightarrow \text{CH}_3\text{CH}_2\text{COOH}$ (which introduces an impossible extra carbon atom). Given the choices typed out, all three represent valid chemical yields. If this is from a specific competitive exam, the question typically alters the carbon chain length on one of the choices to form the "incorrect" option.