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JEE Main2019Chemistry
Q.

The correct decreasing order for acid strength is :-

  1. A

    NO2CH2COOH > NCCH2COOH > FCH2COOH > CICH2COOH

  2. B

    FCH2COOH > NCCH2COOH > NO2CHCOOH > CICH2COOH

  3. C

    NO2CH2COOH > FCH2COOH > CNCH2COOH > CICH2COOH

  4. D

    CNCH2COOH > O2NCH2COOH > FCH2COOH > CICH2COOH

Solution

The acidic strength of the given compounds is decided on the basis of (–I) effect of the substituents of carboxylic acids. Higher the (–I) effect of substituent, higher will be the acidic strength. The decreasing order of (–I) effect of the given substituents is NO 2 > CN > F > Cl.

Therefore, correct decreasing order of acidic strength NO2 NCH2 COOH > NCCH2 COOH > FCH2 COOH > ClCH2 COOH 

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