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Arrange the following in the order of th...

Arrange the following in the order of their incresing reactivity towards HCN:
`CH_(3)CHO, CH_(3)COCH_(3), HCHO, C_(2)H_(5)COCH_(3)`

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`C_(2)H_(5)COCH_(3) lt CH_(3)COCH_(3) lt CH_(3)CHO lt HCHO`
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