Which of the following pairs are tautomers of each other?

A $CH X_{3} CH = NCH X_{3}$ and $CH X_{2} = CH - NHCH X_{3}$
B $CH X_{3} CONH X_{2}$ and $CH X_{3} C (OH) = NH$
C $CH X_{3} CH X_{2} OH$ and $CH X_{3} OCH X_{3}$
D $CH X_{3} NO X_{2}$ and $CH X_{2} = N (O) OH$

Answer: A, B, D

(A) is imine-enamine, (B) is amide-imidic acid and (D) is nitro-aci tautomerism; each involves a proton shift with a shift of the double bond. (C) are functional isomers (alcohol and ether), which cannot interconvert by a simple proton shift.

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Which of the following pairs are tautomers of each other?

Answer: A, B, D

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