The correct decreasing order for acid strength is

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NO2CH2COOH > FCH2COOH > CNCH2COOH > ClCH2COOH

NO2CH2COOH > NCCH2COOH > FCH2COOH > ClCH2COOH

FCH2COOH > NCCH2COOH > NO2CH2COOH > ClCH2COOH

CNCH2COOH > O2NCH2COOH > FCH2COOH > ClCH2COOH

answer is B.

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Detailed Solution

Order of electron-withdrawing effect is -NO2 > -CN > -F > -Cl. So the acid strength order is NO2CH2COOH > NCCH2COOH > FCH2COOH > ClCH2COOH.