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Karnataka Board PUCPUC Science 2nd PUC Class 12

Arrange the following in decreasing order of their acidic strength and give reason for your answer. CHX3CHX2OH,CHX3COOH,ClCHX2COOH,FCHX2COOH,CX6HX5CHX2COOH

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Question

Arrange the following in decreasing order of their acidic strength and give reason for your answer.

\[\ce{CH3CH2OH, CH3COOH, ClCH2COOH, FCH2COOH, C6H5CH2COOH}\]

Short/Brief Note
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Solution

The order is 

\[\ce{ClCH2COOH > FCH2COOH > C6H5CH2COOH > CH3COOH > CH3CH2OH }\]

When compared to other alcohols \[\ce{CH3CH2OH}\] is the least acidic. Because of the halogen, \[\ce{FCH2COOH}\] is quite acidic. It is either an electron-donating group or an electron receiving group in acidic strength. Acidic strength increases as the number of electron withdrawing groups increases. The acidic strength of electron-donating groups diminishes.

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Chapter 12: Aldehydes, Ketones and Carboxylic Acids - Multiple Choice Questions (Type - I) [Page 173]

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NCERT Exemplar Chemistry Exemplar [English] Class 12
Chapter 12 Aldehydes, Ketones and Carboxylic Acids
Multiple Choice Questions (Type - I) | Q 27 | Page 173

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