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What is the correct order of acidity of the following?

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in Chemistry – Class 12 by (188k points)
What is the correct order of acidity of the following?

(a) Acetic acid > Acrylic acid > Propiolic acid

(b) Acetic acid > Propiolic acid > Acrylic acid

(c) Propiolic acid > Acrylic acid > Acetic acid

(d) Acrylic acid > Propiolic acid > Acetic acid

I got this question in exam.

My enquiry is from Carboxylic Acids Chemical Reactions in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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The correct answer is (c) Propiolic acid > Acrylic acid > Acetic acid

To explain: The electronegativity of carbon increases from sp^3 to sp^2 to sp hybridisation. The carbon attached to the carbonyl carbon of propionic acid id sp hybridised (due to triple bond) ang has a higher inductive effect on the COOH group and as a result has higher acidity compared to acrylic acid (sp^2 carbon) or acetic acid (sp^3 carbon).

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