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Unsubstituted hydrocarbon with IUPAC parent name ending with "al"
There is a presence of a carbonyl group (C=O) in the compound. Directly connected to the carbonyl carbon, is hydrogen. That makes the compound an aldehyde. The IUPAC parent name for aldehyde ends with "al".
Also, the given compound is an unsubstituted hydrocarbon since there is no presence of a substituent on the parent chain.