NEET 2017 · ChemistryPrevious Year Question

Which one is the most acidic compound?

Answer: (D) (D). \textbf{Answer:} (d) 2,4,6-trinitrophenol (picric acid) \textbf{Solution:} The $- NO X_{2}$ group exerts strong $- I$ and $- R$ ( $- M$ ) electron-withdrawing effects, which stabilise the phenoxide anion and increase acidity.

A.(A)
B.(B)
C.(C)
D.(D)✓

Correct Answer

(D) (D)

Solution & Explanation

\textbf{Answer:} (d) 2,4,6-trinitrophenol (picric acid) \textbf{Solution:} The $- NO X_{2}$ group exerts strong $- I$ and $- R$ ( $- M$ ) electron-withdrawing effects, which stabilise the phenoxide anion and increase acidity. 2,4,6-Trinitrophenol carries three $- NO X_{2}$ groups (two ortho, one para), giving the maximum stabilisation of the conjugate base and therefore the greatest acidity. Hence (d).

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