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Tetrafluorocarbon is a polymer of tetrafluoroethylene. The English abbreviation is PTFE. The basic structure of polytetrafluoroethylene is - CF2 - CF2 - CF2 - CF2 - CF2 - CF2 - CF2 - CF2 - CF2 - CF2 -. Polytetrafluoroethylene is widely used in various anti-acid bases and organic solvents.

Dibromobenzene can be produced by direct bromination or by diazotization or displacement reaction using the corresponding bromoaniline.

The chemical properties of benzaldehyde are similar to those of fatty aldehydes, but they are also different. The benzaldehyde cannot reduce the Ferin reagent; when the benzaldehyde is reduced by the reagent used in the reduction of the fatty aldehyde