Select the correct IUPAC name for the following branched alcohol: ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\left({\mathrm{CH}}_3\right)-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{OH}$

• A. $4$-methyl-$1$-hexanol
• B. $2$-methyl-$1$-hexanol
• C. $4$-methyl-$2$-hexanol
• D. $5$-methyl-$1$-hexanol

Answer: (A)

Verified step by step guidance

1. Identify the longest carbon chain that contains the hydroxyl (-OH) group. Since the compound is an alcohol, the parent chain must include the carbon bonded to the -OH group.
2. Number the carbon chain starting from the end nearest to the -OH group to give the hydroxyl carbon the lowest possible number. This ensures the correct position of the alcohol functional group in the name.
3. Locate and identify any alkyl substituents (branches) attached to the main chain. In this case, find the methyl group attached to one of the carbons in the chain.
4. Assign the position number to the methyl substituent based on the numbering of the main chain. The position number corresponds to the carbon atom to which the methyl group is attached.
5. Combine the substituent name and position with the parent alcohol name, placing the substituent position and name before the parent name, and the hydroxyl position indicated by the suffix '-ol'. The final IUPAC name format is: \(\text{position of substituent}\)-methyl-\(\text{position of -OH}\)-hexanol.