Which of the following molecules can possess a diad system of tautomerism

C H_{3} C O C H_{3}

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C H_{3} C H_{2} N O_{2}

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H C N

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Solution

The correct option is D $H C N$
Tautomerism is a phenomenon where a single chemical compound tends to exist in two or more interconvertible structures that are different in terms of the relative position of one atomic nucleus which is generally the hydrogen atom.
If the hydrogen atom oscillates between two polyvalent atom which are linked together then it is called a diad system and if the hydrogen atom migrates from 1 to 3, then it is called a triad system.
So,
$H - C \equiv N ⇌ - C \equiv + N - H$
Diad system

All the other options are triad system

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