JEE Advance - Chemistry (2017 - Paper 1 Offline - No. 11)
The IUPAC name(s) of the following compound is (are)
$$1$$-chloro-$$4$$-methylbenzene
$$4$$-chlorotoluene
$$4$$-methylchlorobenzene
$$1$$-methyl-$$4$$-chlorobenzene
Explanation
The IUPAC name of the compound:
1. When two or more substituents such as alkane, halogen, nitro groups, etc., are attached to the aromatic ring (e.g., benzene), these substituents are named in the alphabetical order with substituents of lowest alphabet named first followed by the other.
2. These substituents are numbered in a way with lowest number given to substituent whose name starts with the alphabet that appear first in the series. The direction of numbering is chosen such that next substituent gets the lowest number.
3. After the numbering is complete, the substituents are numbered in alphabetical order.
Hence, the IUPAC name of the compound is 1-Chloro-4-methylbenzene.
4. If a substituent attached to benzene ring together has a common name that has been accepted as an IUPAC name, the compound is called by that common name with other group attached to it as its substituent.
Hence, methyl attached to benzene is commonly called toluene and chlorine is substituent at the fourth position.
The compound is named as 4-chlorotoluene.
1. When two or more substituents such as alkane, halogen, nitro groups, etc., are attached to the aromatic ring (e.g., benzene), these substituents are named in the alphabetical order with substituents of lowest alphabet named first followed by the other.
2. These substituents are numbered in a way with lowest number given to substituent whose name starts with the alphabet that appear first in the series. The direction of numbering is chosen such that next substituent gets the lowest number.
3. After the numbering is complete, the substituents are numbered in alphabetical order.
Hence, the IUPAC name of the compound is 1-Chloro-4-methylbenzene.
4. If a substituent attached to benzene ring together has a common name that has been accepted as an IUPAC name, the compound is called by that common name with other group attached to it as its substituent.
Hence, methyl attached to benzene is commonly called toluene and chlorine is substituent at the fourth position.
The compound is named as 4-chlorotoluene.
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