Organic chemistry problems in senior high school

The concept of aromatic hydrocarbon is that hydrocarbons containing one or more benzene rings will become different derivatives if one or more functional groups are connected. If the hydroxyl group of phenol is connected, it is called phenol, carboxyl group is called aromatic acid, and methyl group is called toluene. However, when connecting some functional groups, the benzene ring itself becomes functional groups, such as connecting aldehyde groups and methyl groups called benzaldehyde. The specific judgment involves the ranking of university function groups, and it is enough for high school to basically master the names.