Question

Which of the following statement(s) is/are correct about the given compound?

• A. It exhibits tautomerism.
• B. It does not react with metallic sodium.
• C. It gives reddish-violet coloration with FeCl$_3$ solution.
• D. It gives precipitate with 2,4-dinitrophenylhydrazine solution.

Hint:

\(\beta\)-keto ester properties:

• Keto–enol tautomerism
• Active methylene acidity
• Positive FeCl\(_3\) (enol form)
• Positive 2,4-DNP (carbonyl present)

Answer 1

The Correct Option is A

Concept: The given compound is a $\beta$-keto ester (like ethyl acetoacetate), containing: \begin{itemize} \item Active methylene group \item Keto–enol tautomerism \end{itemize} (A) Tautomerism $\beta$-keto esters show keto–enol tautomerism due to acidic $\alpha$-hydrogen. Thus true. (B) Reaction with sodium Active methylene hydrogen reacts with Na metal producing H$_2$ gas. So statement is false. (C) FeCl$_3$ test Enol form behaves like phenol and gives colored complex with FeCl$_3$ (reddish-violet). Thus true. (D) 2,4-DNP test Compound contains ketone carbonyl group. Ketones give yellow/orange precipitate with 2,4-DNP. Thus true. Conclusion: Correct statements: A, C, D.