"Bromobenzene" vs "bromophenyl" [duplicate]

What is the difference between the keywords Bromophenyl and Bromobenzene used in organic chemistry.

• Phenyl is an alkyl from benzene, the same as ethyl from ethan. I admit, more logical alkyl name of benzene would be benzyl, but it is already historically reserved for the phenyl-CH2- alkyl. Bromo- is just a prefix for bromine substituent. Nov 13, 2020 at 7:04
• @Poutnik do you mean we use "phenyl" when the ring joined as a alkyl group to the parent chain Nov 13, 2020 at 8:28
• Anywhere where you would use ethyl instead of ethan, you use phenyl instead of benzene. As benzene is $\ce{C6H6}$, while phynyl is $\ce{C6H5}-$. By other words, phenyl is benzene with 1 H removed, making it a single bond substituent. Nov 13, 2020 at 8:36

Bromobenzene is a complete compound, bromophenyl is a description of a unit in a larger compound

Chemists abbreviate some groups to simplify the names of more complex compounds. So while bromobenzene is a complete name for a compound, bromophenyl signals that the unit occurs as part of a larger compound.

In this case–to abuse strict chemical terminology a little–there is a bromobenzene unit attached to to 2 carbon on an ethanol unit and attached at the 2-carbon on the bromobenzene unit so we say 2-bromophenyl not the more complicated "bromobenzene with the hydrogen at the two position replaced by an ethanol unit with the connection being made at the 2-position on the ethanol."

1. Bromobenzene has a molecular formula C6H5Br, while 2-(2-Bromophenyl)ethanol has a molecular formula C8H9BrO.
2. Bromobenzene has a molecular mass of 157.01 g/mol, while 2-(2-Bromophenyl)ethanol has a molecular mass of 201.06 g/mol.
3. In Bromophenyl, a hydrogen from benzene ring is replaced by a functional group, in this case ethanol.

Read more about Bromobenzene and Bromophenyl and the difference between Bromobenzene and Bromophenyl.

• This is not what the question is asking. It's talking about nomenclature and not about the difference in compounds. Even the differences you have provided can be easily seen from the structure. May 26, 2021 at 15:22