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  4. Choose from the indicated protons, the one that is most acidic <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/c-8nluabxe6n3w.png />

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Q. Choose from the indicated protons, the one that is most acidic

Question

NTA AbhyasNTA Abhyas 2020Organic Chemistry – Some Basic Principles and Techniques

Solution:

Solution

Deprotonation of hydrogen labelled $4$ produces a conjugate base which has more stable resonating structure and a resonance structure in which negative charge is present on the electronegative oxygen atom. Therefore, hydrogen labelled $4$ is most acidic.