$CH X_{3} - NH - C X_{6} H X_{4} - NO X_{2}$ with the two substituents para on the ring is correctly named

A4-nitro-N-methylaniline
BN-methyl-3-nitroaniline
C1-(methylamino)-4-nitrobenzene
DN-methyl-4-nitroaniline

Answer: D

The amine is senior to the nitro group (which is only ever a prefix), so the parent is aniline with the N-bearing carbon as C-1. Substituents are: methyl on nitrogen (locant N) and nitro at C-4 (para). Alphabetically methyl precedes nitro: N-methyl-4-nitroaniline.

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Answer: D

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$CH X_{3} - NH - C X_{6} H X_{4} - NO X_{2}$ with the two substituents para on the ring is correctly named