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Among the following, the number of carbo...

Among the following, the number of carboxylic acids which easily undergoes decarboxylation on heating are
`HCOOH, (COOH)_(2), CH_(2)(COOH)_(2), C_(6)H_(5)COCH_(2)COOH, C_(6)H_(5)COCOOH, C_(6)H_(5)CHOHCOOH`

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The correct Answer is:
3
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