✔ 最佳答案
From the picture, the above compound has two functional group:
hydroxy group, aldehyde group
Since aldehyde>hydroxy in the order of IUPAC naming, the compound is an aldehyde.
The aldehyde is bond with a benzene ring and a hydroxy group followed at the 4 position of the benzene. So the IUPAC name of the compound is:
4-hydroxybenzaldehyde