Question

Which electron displacement effect explain the following correct orders of acidity of the carboxylic acids?

Answer 1

CH₃CH₂COOH > (CH₃)₂ CHCOOH > (CH₃)₃ C COOH 

As the number of alkyl group increases, +I effect increases and it strengthen the O-H bond. i.e., O-H bond dissociation is very difficult.

Therefore +I effect explain the correct orders of acidity of the carboxylic acids.