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(CH(3))(2)CO+HCNrarr[A]overset(H(3)O^(+)...

`(CH_(3))_(2)CO+HCNrarr[A]overset(H_(3)O^(+))rarr[B]underset("Heat")overset(H_(2)SO_(4))rarr[C]`

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`underset("Propanone")(CH_(3)COCH_(3))overset(HCN)rarrunderset("Cyanohydrin")(CH_(3)underset(CN)underset(|)(C)(OH))CH_(3)overset(H_(3)O^(+))rarrunderset("propanoic acid[B]")underset("2-Hydroxy-2-methyl")(CH_(3)underset(COOH)underset(|)(C)(OH)CH_(3))underset(-H_(2)O)overset(H_(2)SO_(4)//"Heat")rarrunderset(acid[C])underset("2-Methylpropenoic")(CH_(2)=underset(COOH)underset(|)(C)-CH_(3))`
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