Could someone explain this? Thanks! Which of the following is a correct IUPAC name?
a.
3-bromo-2-chlorotoluene
b.
6-bromo-4-chlorotoluene
c.
2-chloro-3-bromotoluene
d.
2-chloro-4-bromotoluene
To determine the correct IUPAC name, we need to apply the rules of IUPAC nomenclature for organic compounds. Here's how we can find the correct name for this compound:
1. Identify the longest carbon chain: In this case, we have a toluene molecule, which consists of a benzene ring attached to a methyl group (CH3). The longest chain in this molecule is the benzene ring.
2. Number the carbon atoms in the benzene ring: Start numbering from one carbon atom and continue in a way that the substituents (bromine and chlorine) receive the lowest possible numbering. In this case, the bromine (Br) and chlorine (Cl) substituents are at positions 2 and 3, respectively.
3. Name the substituents: The two substituents are bromine (Br) and chlorine (Cl). Following alphabetical order, bromine comes before chlorine.
4. Combine the information: Now we can construct the IUPAC name using the information we have gathered. The correct IUPAC name is obtained by combining the names of the substituents with the parent chain name. In this case, the name will be:
2-chloro-3-bromotoluene (option c)
Therefore, option c, "2-chloro-3-bromotoluene," is the correct IUPAC name.