Which of the following compounds would have the smallest value for `pK_(a)`?

Options

A. `CHF _(2) CH _(2) CH _(2) COOH`
B. `CH _(2) FCHFCH _(2) COOH`
C. `CH _3 CF _(2) CH _(2) COOH`
D. `CH _(3) CH _(2) CF _(2) COOH`

Answer

B

Explanation

Out of all alternates
`pK _(a)` is smallest for `CH _(3) CH _(2) CF_(2) COOH`