Consider the following reaction:
The decreasing order of acidic strengths of (I) phthalic (II) terephthalic, and (III) isophthalic acids are:

I > II > III

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I > III > II

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III > II > I

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II > III > I

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Solution

The correct option is A I > II > III
The decreasing order of acidic strengths of (I) phthalic (II) terephthalic, and (III) isophthalic acids is $(I) p h t h a l i c a c i d > (I I) t e r e p h t h a l i c a c i d > I I I (I I I) i s o p h t h a l i c a c i d s$ . phthalic acid is most acidic due to intramolecular hydrogen bonding which facilitates in deprotonation.

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Consider the following reaction:The decreasing order of acidic strengths of (I) phthalic (II) terephthalic, and (III) isophthalic acids are:

Consider the following reaction:
The decreasing order of acidic strengths of (I) phthalic (II) terephthalic, and (III) isophthalic acids are: