COMEDK2024Morning ShiftChemistryGeneral Organic ChemistryActual
Which one of the following is the correct IUPAC name of the given compound?
Options
- A3-bromo-5,6-dimethyloctan-7-one
- B6-bromo-3,4-dimethyloctan-2-one
- C5-bromo-2,3-dimethylheptan-2-one
- D2-oxo-6-bromo-3,4-dimethyloctane
Correct answer
B. 6-bromo-3,4-dimethyloctan-2-one
Step-by-step solution
The principal functional group is the ketone ( C=O ). Numbering from the end closest to the ketone gives it the lowest locant. Numbering left to right: C₁ : -CH₃ (terminal), C₂ : carbonyl carbon, C₃ : methyl substituent, C₄ : methyl substituent, C₅ : -CH₂- , C₆ : bromo substituent, C₇ : -CH₂- , C₈ : -CH₃ (terminal) Longest chain = 8 carbons octane. Ketone at C₂ octan-2-one. Substituents: bromo at C₆ , methyl at C₃ and C₄ . Listing alphabetically (bromo before methyl): 6-bromo-3,4-dimethyloctan-2-one.