Boiling point- 210- Think what intermolecular interactions are present in each c
ID: 715508 • Letter: B
Question
Boiling point- 210- Think what intermolecular interactions are present in each compound? Are they of imilar strength in each compound? 1.4-Dbrnobenzene is nonpolar, so it has only ctions. 1,2 Dichlorobenzene, on the other hand, is polar, sot le interactions and induced dipole-induced dipole tions are generally assumed to be the more important ac compounds with similar polarizabilities. In this case, however, the two have different polarizabilities. More specifically. 1,4-dibr cantly more polarizable than 1.2-dichlorobenzene because it has 36 more electrons (146 vs. 110, the difference between two Br atoms and two Ci atoms). As a result. ion when should be signift induced dipole-induced dipole interactions are more extensive in 1.4-dibromobenzene enough to give 1,4-dibromobenzene a higher boiling point. problem 2.24 Which of the following compounds do you think has a higher bol ing point? Explain. 2.8 Strategies for Success: Ranking Boiling Points and Solubilities of StructuExplanation / Answer
Compound A (which is benzaldehyde) is a polar compound which means the intermolecular forces present in compound A are dipole - dipole interactions and induced dipole - induced dipole interactions.
Compound B (which is 1,4-diiodobenzene) is a non polar compound because the two iodine atoms on opposite side of each other cancel out polarity of each other. The intermolecular forces present in compound B are only induced dipole - induced dipole interactions.
The two compounds have different polarizabilities.
Compound B (which has 146 electrons) is more polarizable than compound A (which has 56 electrons). As a result the induced dipole - induced dipole interactions in compound B are much stronger than intermolecular forces of compound A and therefore compound B has a higher boiling point.