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SOLUTION:
Step 1:
(a) Acidity of a compound arise when it can lose proton in aqueous solution. Here, due to +M effect of CH3NH- group it pushes the electron density towards the -COOH group through the benzene ring through resonance. So, the electron density on -OH bond of -COOH group is high. So, this proto is not easily available in aqueous solution. The compound will be less acidic and have high pKa value.
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