Question:
For the given compounds, the correct order of increasing \(pK_a\) value :
For the given compounds, the correct order of increasing \(pK_a\) value :
Updated On: Nov 23, 2024
\((E)<(D)<(C)<(B)<(A)\)
\((D)<(E)<(C)<(B)<(A)\)
\((E)<(D)<(B)<(A)<(C)\)
\((B)<(D)<(A)<(C)<(E)\)
- None of these
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The Correct Option is
Solution and Explanation
Explanation:
- Definition of \( pK_a \): Lower \( pK_a \) corresponds to a stronger acid.
- Factors affecting \( pK_a \):
- Electron-withdrawing groups (EWG) increase acidity by stabilizing the conjugate base.
- Electron-donating groups (EDG) decrease acidity by destabilizing the conjugate base.
- Order Analysis:
- (D) Dinitrophenol: Strongest acid due to two nitro (EWG) groups stabilizing the phenoxide ion.
- (B) Nitrophenol: Less acidic than (D), but still acidic due to one nitro group.
- (A) Phenol: Less acidic than (B) due to the absence of strong EWGs.
- (C) Methoxyphenol: The methoxy group (EDG) destabilizes the phenoxide ion, making it less acidic than phenol.
- (E) Methoxy-dinitrophenol: The methoxy group reduces the effect of the nitro groups, making it less acidic than dinitrophenol but more acidic than phenol.
- Final Order: \[ (D) < (B) < (A) < (C) < (E). \]
Final Answer: None of these.
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