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Question

Question: (12) $CH_2-CH_2-CH_3$...

(12) CH2−CH2−CH3CH_2-CH_2-CH_3

Answer

1-propylcyclohexene

Explanation

Solution

  • Structure Identification: The image displays a six-membered cyclic hydrocarbon containing one double bond. This indicates a cyclohexene ring.

  • Substituent Identification: A propyl group (CH2−CH2−CH3CH_2-CH_2-CH_3) is attached to the cyclohexene ring.

  • IUPAC Nomenclature Rules for Cycloalkenes:

    1. The carbons involved in the double bond are always numbered C1 and C2.
    2. Numbering of the ring proceeds in the direction that gives the lowest possible locant (position number) to the substituents.
    3. In the given structure, the propyl group is attached to one of the carbons that form the double bond. Therefore, this carbon is assigned as C1.
    4. The double bond will then be between C1 and C2.

  • Naming: The parent ring is cyclohexene. The substituent is a propyl group at position 1.

  • Final Name: Combining these, the IUPAC name for the compound is 1-propylcyclohexene.

The structure can be visualized as:

The name of the compound is 1-propylcyclohexene.

Explanation of the solution: The compound is a cyclohexene ring with a propyl group attached to one of the double-bonded carbons. According to IUPAC rules, the carbons of the double bond are numbered 1 and 2. The carbon bearing the propyl group is assigned position 1, leading to the name 1-propylcyclohexene.