Given the following structure, what is the correct IUPAC name? $C{H}_3-C{H}_2-C\left(C{H}_3\right)H_2-C{H}_3$

• A. pentane
• B. $2-\mathrm{methylbutane}$
• C. $3-\mathrm{methylbutane}$
• D. isopentane

Answer: (B)

Verified step by step guidance

1. Identify the longest continuous carbon chain in the given structure. This chain determines the base name of the compound according to IUPAC nomenclature.
2. Number the carbon atoms in the longest chain starting from the end nearest to the substituent group to give the substituent the lowest possible number.
3. Identify and name the substituent groups attached to the main chain. In this case, look for alkyl groups such as methyl (-CH3) attached to the main chain.
4. Assign a number to each substituent based on the carbon atom of the main chain to which it is attached. Use this number as a prefix in the name.
5. Combine the substituent names and numbers with the base name of the longest chain to form the full IUPAC name, placing substituents in alphabetical order if there are multiple.