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  4. The correct order of acid strength of the following carboxylic acids is

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Q. The correct order of acid strength of the following carboxylic acids isChemistry Question Image

JEE AdvancedJEE Advanced 2019Organic Chemistry – Some Basic Principles and Techniques

Solution:

+I effect decreases the acidic character of carboxylic acid and -I effect increases the acidic character. Since the electronegativity order of 'C' attached to carboxylic acid is $sp > sp^2 > sp^3$, hence the order is I > II > III > IV.

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