The IUPAC name is :

1-Hydroxy-4-methylpentanoic acid

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1-Methyl-3-hydroxypentanoic acid

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4-Hydroxy-2-methylpentanoic acid

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4-Carboxypentanol-2

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Solution

The correct option is C 4-Hydroxy-2-methylpentanoic acid
Carboxylic acid gets position no.1 always. So position 1 is given to COOH. The other functional group OH becomes a prefix as hydroxy in presence of acid. So IUPAC name is 4-Hydroxy-2-methylpentanoic acid.

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C H_{3} - C H_{3} | C H - O H | C H - C H_{2} - C O O H

C H_{3} C H (O H) C H_{2} C H_{2} C O O H

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