What is the correct IUPAC name for the cyclic compound shown below?\n(Cyclohexane with two methyl groups at positions 1 and 3)

## CORE INFORMATION\n✓ **Answer**: A\n## CONCEPT FRAMEWORK\n **Primary Concept**: IUPAC nomenclature of cyclic alkanes\n **Related Topics**: Alkyl substituents, numbering of cyclic compounds\n **Prerequisites**: Understanding of basic organic chemistry, knowledge of IUPAC rules for naming organic compounds.\n## SOLUTION PATHWAY\n**Given Information**:\n Cyclohexane with two methyl groups at positions 1 and 3.\n \n**Method & Steps**:\n 1. Identify the parent chain: The parent chain is cyclohexane.\n Reasoning: The largest ring is cyclohexane.\n Formula/Rule: The parent chain is the longest continuous carbon chain or the most substituted ring system.\n 2. Number the carbons: Number the carbons of the cyclohexane ring in such a way that the substituents get the lowest possible numbers. In this case, we can start numbering from any carbon, but we want the lowest numbers for the methyl groups. Starting at one methyl group gives 1,3-dimethylcyclohexane. Other numbering schemes would give higher numbers (e.g., 1,5; 2,4; 3,5).\n Working: We can number the carbons clockwise or counterclockwise. Both give the same result if we start at a methyl group. \n Key Point: The goal is to minimize the numbers of the substituents.\n 3. Name the substituents and write the complete IUPAC name:\n The substituents are two methyl groups. The complete name is 1,3-dimethylcyclohexane.\n Result: 1,3-dimethylcyclohexane\n Verification: Check that the numbering is correct and that all substituents are correctly named and positioned.\n ## OPTION ANALYSIS\nA ✓: 1,3-Dimethylcyclohexane: This is the correct name according to IUPAC rules, as it uses the lowest possible numbers for the substituents.\nB :x: 1,5-Dimethylcyclohexane: This is incorrect numbering; it doesn't utilize the lowest possible numbers.\n C :x: 2,4-Dimethylcyclohexane: This is incorrect numbering; it doesn't utilize the lowest possible numbers.\nD :x: 3,5-Dimethylcyclohexane: This is incorrect numbering; it doesn't utilize the lowest possible numbers.\n ## LEARNING AIDS\n **Common Mistakes**:\n 1.Incorrect numbering of the ring: Students might not choose the numbering scheme that gives the lowest possible numbers to the substituents. To avoid this, try multiple numbering schemes and select the one with the lowest numbers.\n 2.Forgetting to list substituents alphabetically: While not applicable here as both substituents are the same, this is important for molecules with different substituents. Always list substituents alphabetically before considering numbering.\n **Quick Tips**:\n 1.Always start numbering at a substituent and proceed in a direction that gives the lowest possible numbers for the remaining substituents.\n 2.Draw out the molecule and try different numbering schemes to confirm the lowest possible numbers.

The correct Option is "1,3-Dimethylcyclohexane"

NEET Chemistry Coordination Compounds MCQs

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