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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 acidI got this question in exam.My enquiry is from Carboxylic Acids Chemical Reactions in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

Answer»

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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