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JEE Advanced levelSingle correct optionDifficulty 3 of 3nm078

The IUPAC name of $HOOC - CH X_{2} - CH (OH) - CHO$ is:

A4-hydroxy-3-oxobutanoic acid
B2-hydroxy-4-oxobutanoic acid
C3-hydroxy-4-oxobutanoic acid
D3-formyl-3-hydroxypropanoic acid

Answer: C

The acid is the principal group (C-1) and the longest chain, which includes the CHO carbon, has four carbons. The OH is on C-3 and the aldehyde carbon, C-4, is cited as oxo. The name is 3-hydroxy-4-oxobutanoic acid.

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