Answer: Option (1) is the correct answer.
Explanation:
The given formula of compound is [tex]CH_{3}CH_{2}CH_{2}CHO[/tex]. It shows that there is presence of aldehyde functional group.
Hence, suffix "al" will be added to the name of compound.
Also there are four carbon atoms in this compound. Therefore, name of the given compound will be butanal.
Thus, we conclude that option (1) represents correct IUPAC name of the compound.
