Which acid of each pair shown here would you expect to be stronger?

CH₂FCH₂CH₂CO₂H or CH₃CHFCH₂CO₂H

Inductive effect decreases with increase in distance(the more will be the distance of the inductive group from the carboxylic group less will be its effect of polarisability). Hence, the -I effect of F in CH₃CHFCH₂CO₂H is more than it is in CH₂FCH₂CH₂CO₂H . Hence, CH₃CHFCH₂CO₂H is a stronger acid than CH₂FCH₂CH₂CO₂H .