IUPAC name of the following compound (P) is:
1-Ethyl-5, 5-dimethylcyclohexane
3-Ethyl-1,1-dimethylcyclohexane
1-Ethyl-3, 3-dimethylcyclohexane
1,1-Dimethyl-3-ethylcyclohexane
The Correct Option is B
Approach Solution - 1
The compound depicted in the image is a cyclohexane derivative with additional alkyl groups attached. To determine its IUPAC name, we need to follow these steps:
- Identify the main carbon chain: The base structure is a cyclohexane ring.
- Identify substituents:
- There is an ethyl group attached to the carbon chain.
- There are two methyl groups attached to the same carbon atom.
- Number the carbon atoms in the ring to give the substituents the lowest possible numbers:
- Start numbering from the carbon with the substituents that will obtain the lowest set of locants. Here, the carbon with two methyl groups is numbered as 1.
- Continuing the numbering around the ring gives the ethyl group position 3 (clockwise numbering).
- Compile the name:
- The compound is named as 3-Ethyl-1,1-dimethylcyclohexane, indicating the positions and types of substituents.
Therefore, the correct IUPAC name for the compound is 3-Ethyl-1,1-dimethylcyclohexane.
To confirm the correct choice among the options:
- 1-Ethyl-5,5-dimethylcyclohexane - Incorrect numbering place for substituents.
- 3-Ethyl-1,1-dimethylcyclohexane - Correct, as reasoned above.
- 1-Ethyl-3,3-dimethylcyclohexane - Incorrect placement for ethyl group.
- 1,1-Dimethyl-3-ethylcyclohexane - Incorrect order of substituents.
Approach Solution -2
The correct IUPAC name for the compound shown is 3-Ethyl-1,1-dimethylcyclohexane. The longest carbon chain attached to the cyclohexane ring determines the naming priority. The substituents are numbered to give the lowest possible locants.
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Concepts Used:
Nomenclature of Organic Compounds
Nomenclature of Organic Compounds can be defined as the systematic approach to name different organic compounds present in the world. In order to avoid some long and tedious common names in the general communication, the officials of the International Union of Pure and Applied Chemistry (IUPAC) have formulated some structured way of naming the organic compounds.
IUPAC Nomenclature:
International Union of Pure and Applied Chemistry (IUPAC) introduced the classical nomenclature for the organic compounds systematically. Some rules were introduced such that every molecule has an individual name for its different structures.
The general skeleton of an IUPAC nomenclature is given as:
Primary prefix + word root + primary suffix + secondary suffix
Guidelines set by IUPAC:
- The Longest Chain Rule
- The Lowest Set of Locants
- Multiple instances of the same substituent
- Naming of different substituents
- The naming of different substituents present at the same positions
- Naming Complex Substituents