Question

What is the correct $IUPAC$ name of the compound given below?

• A. $1,3,4$-tribromo-$2,5,6$-trichlorobenzene
• B. $3,5,6$-tribromo-$1,2,4$ -trichlorobenzene
• C. $3,4,6$-tribromo-$1,2,5$ -trichlorobenzene
• D. $1,2,4$ -tribromo-$3,5,6$ -trichlorobenzene

Answer 1

Answer: (D)

All the carbon of ring has halide locants hence, same number series would be obtained in all cases. Therefore, numbering would be done giving preference to bromo locants as it comes before chloro in alphabetical order

Lower possible numbers are given to bromo locant positions