Correct order of acidity of protons marked A-D:

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Canvas Classes · Accepted Answer

Step 1: Identifying Acidic Sites
- : Carboxylic acid proton (Strongest acid, ).
- : Benzylic/Alpha proton (Stabilized by resonance with ring and carbonyl).
- : Terminal alkyne proton ( hybridized Carbon, ).
- : Benzylic/Propargylic proton ( Carbon, less acidic than ).

Step 2: Acidic Strength Order

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