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B
1-Carboxy-3-butanoic acid
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C
1-Carboxy-4-butanol
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D
4-Carboxy-2-butanol
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Solution
The correct option is A 4-Hydroxypentanoic acid Carboxylic functional group is prior to hydroxyl group. Hence, the numbering of carbon chain will start from the carbon of carboxylic acid. Here, −OH group is attached to the fourth carbon.
Therefore, the IUPAC name of given compound is 4-Hydroxypentanoic acid.