Question
Arrange the Hydrogen of the following compounds from most acidic to least acidic :
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
E > C > B > D > A
To determine the acidity of the compounds, we assess the stability of their conjugate bases after the hydrogen is removed. Factors influencing acidity include electronegativity, resonance, inductive effect, and hybridization.
- Compound E: The hydrogen in compound E is attached to a positively charged oxygen in an oxonium ion. Oxonium ions are very strong acids because the conjugate base, upon losing \(H^+\), is neutral and stable.
- Compound C: This is a dichloroacetic acid derivative. The Cl atoms exert a strong electron-withdrawing inductive effect, stabilizing the conjugate base. Hence, it is highly acidic.
- Compound B: The hydrogen in compound B is in trifluoroethanol. The presence of electronegative F atoms leads to strong stabilizing inductive effects, making it more acidic than many typical alcohols.
- Compound D: An enolic hydrogen, stabilized by resonance in the conjugate base (an enolate ion), but less so than in the stronger acids above.
- Compound A: The hydrogen in compound A is in an amine. Amines are generally weak acids as the loss of \(H^+\) results in an unstable nitrogen anion.
Ranking the compounds from most acidic to least acidic based on the above analysis leads us to the order: E > C > B > D > A.
Thus, the correct answer is: E > C > B > D > A.
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