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JEE Main levelSingle correct optionDifficulty 2 of 3nm193

The number of open-chain amides (including N-substituted amides and formamides; the $- CO - N$ unit must be present) of formula $C X_{3} H X_{7} NO$ is

A3
B4
C5
D6

Answer: B

Propanamide; N-methylethanamide; N-ethylmethanamide (N-ethylformamide); N,N-dimethylmethanamide (DMF). That is 4.

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