First slide

Nomenclature

Question

What is the correct IUPAC name of the compound shown below?

Moderate

A

5-Bromo-2-chloro- 1 -cyclobutyl-6-cyclohexyl- 1, 6-dimethyl-3-hexyne
B

5-Bromo-2-chloro- 1 -cyclobutyl-6-cyclohexyl- 1-methyl-3-heptyne
C

3-Bromo-6-chloro-7-cyclobutyl-2-cyclohexyl-4-octyne
D

6-Bromo-3 -chloro-2-cyclobutyl-7-cyclohexyl-4-octyne

Solution

Longest chain has eight carbon and locants as well as triple bonds are equidistant from the terminals. Hence, numbering is done in alphabetical order giving preference to first different locant cyclobutyl over cyclohexyl.

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