What is the correct order of pKa values of the following acids?(a) Benzoic acid > m-Nitrobenzoic acid > p-Nitrobenzoic acid(b) Benzoic acid > p-Nitrobenzoic acid > m-Nitrobenzoic acid(c) p-Nitrobenzoic acid > m-Nitrobenzoic acid > Benzoic acid(d) m-Nitrobenzoic acid > p-Nitrobenzoic acid > Benzoic acidThis question was addressed to me during a job interview.My question is based upon Carboxylic Acids Chemical Reactions in portion Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

What is the correct order of pKa values of the following acids?(a) Ben

1.	What is the correct order of pKa values of the following acids?(a) Benzoic acid > m-Nitrobenzoic acid > p-Nitrobenzoic acid(b) Benzoic acid > p-Nitrobenzoic acid > m-Nitrobenzoic acid(c) p-Nitrobenzoic acid > m-Nitrobenzoic acid > Benzoic acid(d) m-Nitrobenzoic acid > p-Nitrobenzoic acid > Benzoic acidThis question was addressed to me during a job interview.My question is based upon Carboxylic Acids Chemical Reactions in portion Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Answer» Right choice is (a) Benzoic acid > m-Nitrobenzoic acid > p-Nitrobenzoic acid Easy EXPLANATION: Nitro group is electron withdrawing in NATURE and increases the acidic strength of acids. The electron withdrawing effect of NO2 is PRONOUNCED at para POSITION more than meta position, hence the p-isomer is more acidic and has a lower pKa value than m-isomer.

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