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Write chemical equation to show Popoff's...

Write chemical equation to show Popoff's rule.

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During oxidation of an unsymmetrical ketone with conc. `HNO_(3)` (50%) the smaller alkyl goes preferentially with the carbonyl group in the resulting carboxyl acid. For example,
`underset("Pentan -2-one")(CH_(3)-overset(O)overset(||)(C)-C_(3)H_(7)) + [O] overset("Conc. " HNO_(3))rarr underset("Ethanoic acid")(CH_(3)COOH) + underset("Propanoic acid")(CH_(3)CH_(2)COOH)`
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