Question

Which of the following represents the correct order of the
acidity in the given compounds?
(a) FCH₂COOH > CH₃COOH > BrCH₂COOH >
ClCH₂COOH
(b) BrCH₂COOH > ClCH₂COOH > FCH₂COOH >
CH₃COOH
(c) FCH₂COOH > ClCH₂COOH > BrCH₂COOH >
CH₃COOH
(d) CH₃ COOH > BrCH₂COOH > ClCH₂COOH >
FCH₂COOH

Answer 1

the following represents the correct order of the acidity in the given compounds:-

FCH₂COOH > ClCH₂COOH > BrCH₂COOH > CH₃COOH

- Electron withdrawing groups attached to a carboxylic acid increases its acidity

- this is due to the fact that that these electron withdrawing groups stabilises the carboxylate anion

- due to this it gets strengthened

- fluorine is most electron withdrawing, chlorine is less than that and bromine is the least among them

- so the correct order is given as in option (c) FCH₂COOH > ClCH₂COOH > BrCH₂COOH > CH₃COOH