Which of the following compounds would have the smallest value for pK_ – InterviewSolution

1.	Which of the following compounds would have the smallest value for pK_(a)?
Answer» `CHF_(2)CH_(2)CH_(2)COOH` `CH_(3)CH_(2)CF_(2)COOH` `CH_(2)FCHFCH_(2)COOH` `CH_(3)CF_(2)CH_(2)COOH` Solution :`-F` is a strong electron withdrawing group. Electron withdrawing group. Electron withdrawing group PRESENT nearer to the -COOH group has more acidic strength, hence low `pK_(a)` value.

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