Question

The IUPAC name of given compound is CC1=CCCCC1Br (A) 2-Bromo-1-methyl cyclohexene (B) 6 -Bromo- 1 -methyl cyclohexene (C) 1-Bromo-2-methyl cyclohexene (D) \(1-\) Bromo-2-methyl cyclohex-2-ene

Short answer

The correct IUPAC name for the given compound is 6-Bromo-1-methylcyclohexene, which corresponds to option (B).

Step-by-step solution

Convert SMILES notation to chemical structure

First, let's convert the given SMILES notation (CC1=CCCCC1Br) into a chemical structure. According to the SMILES notation, the compound is a cyclohexene ring with a bromine atom and one methyl group. The chemical structure is as follows: Br | C / \ C C / \ C C=C \ / C C \ / C | CH3 Now we have the chemical structure of the compound, and we are ready to name it according to the IUPAC nomenclature.

Identify the functional groups and their positions

Next, we need to identify the functional groups present in the compound and their positions on the cyclohexene ring. The compound contains an alkene group (C=C), a bromine atom, and a methyl group. The alkene group is considered as the primary functional group that we need to give priority numbering.

Number the carbon atoms in the cyclohexene ring

Now, we need to number the carbon atoms in the cyclohexene ring, starting from the double-bonded carbon and moving clockwise to grant the lowest number to the other substituents, which are the bromine atom and the methyl group. So the numbering is: Br (2) | C / \ (1) C=C C C (3) / \ C C \ / C C \ / C | CH3 (6)

Write the IUPAC name using the numbering and substituents

Now that we have our numbering, we can write the IUPAC name of the compound: 2-Bromo-6-methylcyclohexene. Comparing this name to the given options, we can conclude that the correct answer is: (B) 6 -Bromo- 1 -methyl cyclohexene