Question

IUPAC name of following hydrocarbon (X) is :

• A. 2-Ethyl-3,6-dimethylheptane
• B. 2-Ethyl-2,6-diethylheptane
• C. 2,5,6-Trimethyloctane
• D. 3,4,7-Trimethyloctane

Answer 1

The Correct Option is C

The IUPAC name for the given hydrocarbon is determined through the following procedure:

1. Locate the principal longest carbon chain. In this instance, an 8-carbon chain is identified, establishing the parent name as "octane".
2. Number the carbon chain to assign the lowest locants to the substituents. The substituents in this structure are methyl groups.
3. Name and locate the substituents:
   • A methyl group is attached to carbon 2.
   • A second methyl group is attached to carbon 5.
   • A third methyl group is attached to carbon 6.
4. Synthesize the substituent names with the parent name, incorporating locant information:
   • The presence of three methyl groups necessitates the prefix "trimethyl".
   • The positions of these methyl groups are 2, 5, and 6.
5. The complete IUPAC nomenclature for this compound is "2,5,6-Trimethyloctane".

This nomenclature aligns with the correct provided answer.