Final answer:
The compounds' relationships are based on intermolecular forces due to polarity, isomerism, and differences in molecular composition as per the law of multiple proportions. Boiling points and reactivity are impacted by molecular structure and the nature of chemical bonds.
Step-by-step explanation:
The relationship between the mentioned compounds can be understood by applying concepts of molecular structure and the laws of chemical composition. The compounds with similar molar masses but different boiling points are influenced by their polarity and the resulting dipole-dipole interactions that affect their physical properties like boiling points. Such differences can also point out the presence of isomers, molecules with the same molecular formula but different structures and properties. In addition, the reference to the law of multiple proportions suggests that compounds can have different ratios of their constituent elements, as seen with compounds like carbon monoxide (CO) and carbon dioxide (CO₂). In organic chemistry, understanding the nature of bonding, whether ionic or covalent, and the structure of molecules is crucial for predicting their chemical reactivity and physical properties.