Which of the following is the correct order of decreasing acid strength (more acidic > less acidic)?
1) ICH₂COOH > ClCH₂COOH > FCH₂COOH
2) Cl₂CHCOOH > ClCH₂COOH > CH₃COOH
3) CH₃CH₂OH > FCH₂COOH > ClCH₂COOH
4) CH₃COOH > FCH₂COOH > CH₃CH₂OH