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The correct decreasing order for acid strength is :

1. NO 2 CH 2 COOH > FCH 2 COOH > CNCH 2 COOH > ClCH 2 COOH
2. CNCH 2 COOH > O 2 NCH 2 COOH > FCH 2 COOH > ClCH 2 COOH
3. FCH 2 COOH > NCCH 2 COOH > NO 2 CH 2 COOH > ClCH 2 COOH
4. NO 2 CH 2 COOH > NCCH 2 COOH > FCH 2 COOH > ClCH 2 COOH

Correct answer: NO 2 CH 2 COOH > NCCH 2 COOH > FCH 2 COOH > ClCH 2 COOH

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