The IUPAC name of (CH3)2CH-CH2-CO-NH-CH3 is:

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JEE Advanced levelSingle correct optionDifficulty 3 of 3nm084

The IUPAC name of $(CH X_{3}) X_{2} CH - CH X_{2} - CO - NH - CH X_{3}$ is:

A3-methyl-N-methylbutanamide
BN,2-dimethylbutanamide
CN,3-dimethylbutanamide
DN,N-dimethylbutanamide

Answer: C

The acyl chain

- CO - CH X_{2} - CH (CH X_{3}) - CH X_{3}

has four carbons (carbonyl C-1), so the parent is butanamide with a methyl on C-3. The second methyl is on nitrogen. Identical prefixes are merged as dimethyl with the locants N,3, giving N,3-dimethylbutanamide.

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The IUPAC name of (CHX3​)X2​CH−CHX2​−CO−NH−CHX3​ is:

Answer: C

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The IUPAC name of $(CH X_{3}) X_{2} CH - CH X_{2} - CO - NH - CH X_{3}$ is: