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How many different carboxylic acids are ...

How many different carboxylic acids are obtained when all the isomeric arenes having the molecular formula `C_(8)H_(10)` are oxidised with alk. `KMnO_(4)` followed by acidification ?

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The correct Answer is:
4
Four isomeric carboxylic acids are formed from four different arenes : ethylbenzene → benzoic acid, o-xylene → phthalic acid, m-xylene→ isophthalic acid and p-xylene → terephthalic acid.
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