Question

What is correct IUPAC name of the compound shown below?

• A. 5,6-dibromo-6-chloro-1,3-cyclohexadiene
• B. 2,3-dibromo-6-chloro-1,4-cyclohexadiene
• C. 1,2-dibromo-1-chloro-3,5-cyclohexadiene
• D. 5,6-dibromo-5-chloro-1,3-cyclohexadiene

Answer 1

The correct option is D 5,6-dibromo-5-chloro-1,3-cyclohexadiene

Amongst halo substituents and double bonds, double bonds get priority. Hence, we follow the least locant rule and consider the point of first difference.
So, we can write the IUPAC name as 5,6-dibromo-5-chloro-1,3-cyclohexadiene