Which of the following have maximum PKa value ?

Options:

a. CH₃-CF-COOH                                                 b.  F-CH₂-CH₂-COOH

c. CH₃-CHBr-COOH                                             d.  CH₂Br-CH₂-COOH

Answer: (d)

Reason:

              Minimum –I Effect

              Minimum acidic strength

              Minimum K^a

              Maximum P^ka