Question

The correct IUPAC name of the following structure :

• A. 1-(1-chloropropyl)-3-(3-chloropropyl)-cyclobutane.
• B. 1-(3-chloropropyl)-3-(1-chloropropyl)-cyclobutane
• C. 3,9-chloro-4,6-dimethylnonane
• D. 1,7-chloro-4,6-dimethylnonane

Answer 1

The correct option is A 1-(1-chloropropyl)-3-(3-chloropropyl)-cyclobutane.

In both the substituents chloro group is there.
When two or more prefixes consist of identical roman letters, priority for citation is given to the group which contains the lowest locant at the first point of difference.
Here 1-chloropropyl gets priority over 3-chloropropyl as shown


The correct IUPAC name of the above structure is 1-(1-chloropropyl)-3-(3-chloropropyl)-cyclobutane.