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Question

Which of the following presents the correct order of the acidity in the given compounds?


A

FCH2COOH>ClCH2COOH>BrCH2COOH>CH3COOH

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B

CH3COOH>BrCH2COOH>ClCH2COOH>FCH2COOH

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C

FCH2COOH>CH3COOH>BrCH2COOH>ClCH2COOH

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D

BrCH2COOH>ClCH2COOH>FCH2COOH>CH3COOH

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Solution

The correct option is A

FCH2COOH>ClCH2COOH>BrCH2COOH>CH3COOH


Acetic acid is the least acidic because there are no electronegative substituents at the α position. The presence of such an electronegative substituent tends to stabilize the negative charge present in the conjugate base of the given acids (via -I effect). Hence the increasing order of acidic strength is:

FCH2COOH>ClCH2COOH>BrCH2COOH>CH3COOH


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