Question

*identify each pair of condensed structural formulas as structural isomers or the same molecule* 1) CH3-CH-CH3 CH3-CH2-CH2-CH3

CH3
2) CH2-CH2-CH3 CH3-CH2-CH2-CH2
H3C-CH2 CH3

Answer 1

To determine if two condensed structural formulas are structural isomers or the same molecule, one must compare the connectivity of atoms and the positions of functional groups, with different arrangements indicating isomers.

Step-by-step explanation:

The concept in question is the identification of structural isomers or identification of the same molecule when given a pair of condensed structural formulas. Isomers are compounds that have the same molecular formula but different structures. While geometric isomers have a different spatial arrangement around a double bond or ring, structural isomers differ in how atoms are connected or the position of functional groups.

For example, the molecule butane has a molecular formula of C4H10, and it has a structural isomer called 2-methylpropane. To identify if two given structural formulas represent structural isomers or the same molecule, you would compare the connection of atoms in each molecule. If the atom connections or functional groups differ, they are isomers; if not, they are the same molecule.

Regarding the condensed structural formulas presented in the question (which appeared to contain typos), one would analyze the chains and branching to determine if they describe isomers or the identical compound. Remember that rearrangements such as the rotation around single bonds don't result in different isomers but are merely different representations of the same molecule.