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Question

The decreasing order for acidic strength is:

A
NO2CH2COOH>NCCH2COOH>FCH2COOH>ClCH2COOH
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B
FCH2COOH>NCCH2COOH>NO2CHCOOH>ClCH2COOH
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C
NO2CH2COOH>FCH2COOH>CNCH2COOH>ClCH2COOH
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D
CNCH2COOH>O2NCH2COOH>FCH2COOH>ClCH2COOH
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Solution

The correct option is A NO2CH2COOH>NCCH2COOH>FCH2COOH>ClCH2COOH
The electron-withdrawing group increases the acidic strength.

Here the strength of electron-withdrawing group is in the following order:

NO2>CN>F>Cl

Thus, acidic strength is given as:

NO2CH2COOH>NCCH2COOH>FCH2COOH>ClCH2COOH

Hence, the correct option is A.

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