Which of the following is the correct IUPAC name for a compound with the structure ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$?

• A. Pentane
• B. Butane
• C. Hexane
• D. Propane

Answer: (A)

Verified step by step guidance

1. Identify the structure given: it consists of a chain of carbon atoms connected in a row. The notation ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$ represents a continuous chain of carbon atoms with hydrogens filling the remaining valences.
2. Count the number of carbon atoms in the longest continuous chain. Each $CH\_3$ or $CH\_2$ group corresponds to one carbon atom. Here, the chain has 5 carbon atoms in total.
3. Recall the IUPAC nomenclature for alkanes: the prefix indicates the number of carbon atoms, and the suffix '-ane' indicates single bonds. The prefixes are: 1 carbon = Meth-, 2 carbons = Eth-, 3 carbons = Prop-, 4 carbons = But-, 5 carbons = Pent-, 6 carbons = Hex-, etc.
4. Since the chain has 5 carbons, the correct prefix is 'Pent-'. Adding the suffix '-ane' gives the name 'Pentane'.
5. Verify that there are no branches or functional groups that would change the name. Since the structure is a straight chain alkane with no substituents, the correct IUPAC name is 'Pentane'.