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dear geoffery , u are right dicarboxylic acids are more acidic than mono carboxylic acid due to inductive effect ..
benzene 1,4 dicarboxylic acid cannot be less acidic than benzoic acid ...
The name they themselves have written is ( below the image) 4-Methoxy benzoic acid which has an Electron
releasing group) and hence it makes sense for it to be less acidic than benzoic acid , but they have given structure
of benzene 1,4 di carboxylic acid instead of 4 metoxy benzoic acid ....
To doubly confirm that you may check the value of pKa for 4-Methoxy benzoic acid and I am sure it should be more than 4.19 and should be close to or equal to 4.46.
Sometimes, even standard texts have errors and can create confusion.
Yeah Vikas u r right 4-methoxy bezoic acid has a pKa value of 4.47 dats close to 4.46 !!!!
Thanks alot man !!!
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