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What is the difference between the keywords Bromophenyl and Bromobenzene used in organic chemistry.enter image description here

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  • $\begingroup$ 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. $\endgroup$
    – Poutnik
    Commented Nov 13, 2020 at 7:04
  • $\begingroup$ @Poutnik do you mean we use "phenyl" when the ring joined as a alkyl group to the parent chain $\endgroup$
    – Debakant
    Commented Nov 13, 2020 at 8:28
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    $\begingroup$ 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. $\endgroup$
    – Poutnik
    Commented Nov 13, 2020 at 8:36

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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."

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