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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm065

Select the correct statements about IUPAC names.

AThe compound $CH X_{3} - CH (OH) - CH X_{2} CH X_{2} - NH X_{2}$ is 3-aminobutan-1-ol.
BThe compound $CH X_{3} - CO - CH X_{2} - COOCH X_{3}$ is methyl 3-oxobutanoate.
CThe compound $CH X_{3} CH X_{2} - CO - CH (CH X_{3}) X_{2}$ is 2-methylpentan-3-one.
DThe compound $HOOC - CH X_{2} CH X_{2} CH X_{2} - CHO$ is 4-oxopentanoic acid.

Answer: B, C

CH X_{3} CH X_{2} COCH (CH X_{3}) X_{2}

: C=O is C-3 from either end, so the methyl gets the lower locant 2: 2-methylpentan-3-one (true).

CH X_{3} COCH X_{2} COOCH X_{3}

is methyl 3-oxobutanoate (true).

HOOC (CH X_{2}) X_{3} CHO

is 5-oxopentanoic acid; 4-oxopentanoic acid is

CH X_{3} COCH X_{2} CH X_{2} COOH

(false).

CH X_{3} CH (OH) CH X_{2} CH X_{2} NH X_{2}

is 4-aminobutan-2-ol, since the OH takes the lowest locant (false).

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