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NEET levelSingle correct optionDifficulty 1 of 3g2171

The imidic acid tautomer of acetamide, $CH X_{3} CONH X_{2}$ , is

A $CH X_{3} - NH - CHO$
B $CH X_{3} - C (OH) = NH$
C $CH X_{3} - CH = N - OH$
D $CH X_{3} CH X_{2} - N = O$

Answer: B

Amide-imidic acid tautomerism shifts a hydrogen from nitrogen to oxygen, with the double bond moving from

C = O

to

C = N

. This gives

CH X_{3} - C (OH) = NH

. The other three are isomers of

C X_{2} H X_{5} NO

but cannot be formed by a simple proton shift.

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