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Yes it is true . According to latest IUPAC rules of 1993 2-butenal is more precisely written as but-2-en-1-alIt is dehydrated product of aldol. Common name is crotonaldehyde but-2-en-1-al & but-2-enal both are 100 % correct because their meaning is same & is a unique name Ref : latest Rules of IUPAC published in 1993

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