Question

what would be the name of the following compound? ch3 ch3 h a) 2,3-dimethylcyclopentene b) 1,5-dimethylcyclopentene c) cis-2,3-dimethylcyclopentene d) cis-1,5-dimethylcyclopentene e) trans-2,3-dimethylcyclopentene

Answer 1

The molecule CH3 CH3 H, considering the cyclic nature implied by the question and following IUPAC nomenclature rules for cycloalkenes, is named cis-1,3-dimethylcyclopentane.

Step-by-step explanation:

The correct name for the compound CH3 CH3 H in a cyclic structure is cis-1,3-dimethylcyclopentane. This name is derived by following IUPAC nomenclature rules:

1. Identify the longest continuous carbon chain that contains the functional group (e.g., double bond).
2. Number the carbon atoms in the longest chain so that the functional group receives the lowest possible number.
3. If there are substituents, their positions are indicated by the numbers corresponding to the carbon atoms to which they are attached.
4. For structures with the same substituents on the same side of the double bond, the prefix cis is used. If they are on opposite sides, the prefix trans is used.

The compound given has two methyl groups (CH3) on a cyclopentane ring, positioned on carbons 1 and 3. Since both methyl groups are on the same side of the ring (cis configuration), the correct name is cis-1,3-dimethylcyclopentane.