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A benzene ring with two substituents, a bromo and chloro substituent. Each substituent is placed on a carbon two carbons away from the other. The parent name is benzene and there is a chloro and bromo substituent. Disubstituted benzenes can be described using the terms ortho, meta and para, depending on their relative distance from each other. The terms are often just abbreviated as o, m and p. In addition, the IUPAC name can use locant numbers instead of the descriptor.

a. 1-bromo-3-chlorobenzene
b. 3-bromo-1-chlorobenzene
c. meta-bromochlorobenzene
d. o-bromochlorobenzene
e. ortho-bromochlorobenzene
f. m-bromochlorobenzene

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The correct name of the structure given in the question is 1–bromo–3–chloro benzene (Option A)

How to name organic compounds

The naming of organic compounds follows the standard of the international union of pure and applied chemistry (IUPAC).

To name a compound, we must

  • Locate the longest continuous carbon chain and determine the functional group of the compound. This gives the name of the compound.
  • Locate the substituent groups attached
  • Give the substitute group the lowest locate by naming alphabetically
  • Combine the above to obtain the name of the compound.

How name the compound

  • The compound is a benzene ring
  • The substituent groups attached are bromo (Br) and Chloro (Cl)
  • The Br is at carbon 1 while Cl is at carbon 3
  • Therefore, the name of the compound is 1–bromo–3–chloro benzene

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