Convert structures 1 and 2 Newman projections to the corresponding line-angle formula. Determine the appropriate IUPAC name for each formula.
Structure 1
Structure 2
Which of the following is correct?
A. 2-methylpentane
B. n-propane
C. 2,2-dimethylbutane
D. 3-methylpentane
E. 2-methylpropane
Answer (1)
Structure 1 corresponds to 3-methylpentane.
Structure 2 corresponds to 2,2-dimethylbutane.
Therefore, the answer is D for Structure 1 and C for Structure 2.
The final answer is C and D.
Explanation
Problem Analysis We need to convert the given Newman projections to their corresponding line-angle formulas and then identify the correct IUPAC name for each from the provided options.
Structure 1 Analysis Structure 1 represents a molecule where, looking down the central bond, we see a methyl group ( C H 3 ) and an ethyl group ( C H 2 C H 3 ) on one carbon, and two methyl groups and a hydrogen on the other carbon. This corresponds to 3-methylpentane.
Structure 2 Analysis Structure 2 represents a molecule where, looking down the central bond, we see three methyl groups attached to the front carbon and three hydrogens attached to the back carbon. This corresponds to 2,2-dimethylbutane.
Matching IUPAC Names Matching the IUPAC names with the given options, we find that Structure 1 is 3-methylpentane (option D) and Structure 2 is 2,2-dimethylbutane (option C).
Examples
Understanding the structure and naming of organic molecules is crucial in many fields. For example, in drug discovery, chemists need to accurately represent and name molecules to communicate their findings effectively. Similarly, in materials science, the properties of a material are often directly related to its molecular structure, making accurate representation and naming essential. Knowing how to convert Newman projections to line-angle formulas and name them using IUPAC nomenclature allows scientists to unambiguously describe and identify chemical compounds.
