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Identify A,B,C,"….." in the given react...

Identify `A,B,C,"….."` in the given reaction sequence .
`D underset((ii)H^(+))overset( (i) NaOH)(larr) C underset("excess")overset( P //Br_(2))(larr)CH_(3)COOH overset( SOCl_(2))(rarr) Aoverset( R ) ( rarr) CH_(3)CHO underset( Delta ) overset( "dil. NaOH") ( rarr) B `

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To identify the compounds A, B, C, D, and R in the given reaction sequence, we will analyze each step carefully. ### Step-by-Step Solution: 1. **Identify D**: The reaction starts with a carboxylic acid, which is acetic acid (CH₃COOH). This is our compound D. 2. **Formation of C**: The first reaction involves treating acetic acid with phosphorus bromide (PBr₂) in excess. This is a Hell-Volhard-Zelinsky (HVZ) reaction, which brominates the alpha carbon of the carboxylic acid. The product formed will be 2-bromoacetic acid (C). Thus, C = CH₂BrCOOH. ...
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