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B
Butan -2-oic acid
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C
3 - Methylbutanoic acid
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D
2 - Methylbutanoic acid
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Solution
The correct option is D 2 - Methylbutanoic acid In (CH3)(COOH)CH−CH2−CH3, the functional group is carboxylic acid;-COOH and thus lowest numbering is given to it. Thus the parent chain has four carbon atoms and a methyl substituent at C2.The IUPAC name can be written as;2 - Methylbutanoic acid.