MCQ
Identify the which can exhibit tautomerism ?


- A$I$ only
- B$II$ only
- C$III$ only
- Dall of these

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The total number of methyl $\left(- CH _3\right)$ group($s$) in compound $S$ is. . . .
$(A)$ Internal energy $(B)$ Irreversible expansion work
$(C)$ Reversible expansion work $(D)$ Molar enthalpy