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Final Answer:Thecompoundsarranged in order of increasingboiling pointare a) CH₃CH₂CH₂OH (-42°C), b) CH₃CH₂OH (78°C), c) HOCH₂CH₂OH (117°C), and d) CH₃CH₂CH₃ (198°C).Explanation:The boiling point of a compound is influenced by itsmolecularweight, intermolecular forces, and branching. In this case, we observe the following trends in the given compounds:The compound with the lowest boiling point is CH₃CH₂CH₂OH (-42°C) due to its small molecular weight and weak Londondispersionforces.Next is CH₃CH₂OH (78°C) with slightly higher boiling point, attributed to stronger dipole-dipole interactions resulting from the presence of an oxygen atom in the molecule.HOCH₂CH₂OH (117°C) follows, as it contains two hydroxyl groups enhancing intermolecular hydrogen bonding, leading to a higher boiling point.CH₃CH₂CH₃ (198°C) has the highest boiling point among the given compounds due to its nonpolar nature and greater molecular weight.In summary, theincreasing orderof boiling points is a) CH₃CH₂CH₂OH (-42°C), b) CH₃CH₂OH (78°C), c) HOCH₂CH₂OH (117°C), and d) CH₃CH₂CH₃ (198°C).Learn more aboutBoiling pointbrainly.com/question/5753603#SPJ11...