The Aldrich Chemical Company catalogue lists the three isomers of xylene as having boiling points of 143-145°C, 138-139°C, and 138°C. Which isomer has the highest boiling point, and why?
A) o-xylene (1,2-dimethylbenzene) because of its polarity
B) p-xylene (1,4-dimethylbenzene) because of its polarity
C) p-xylene (1,4-dimethylbenzene) because of its para-normalcy
D) m-xylene (1,3-dimethylbenzene) because of its C2 symmetry
E) o,m,p-xylene (1,2,3,4-tetramethylbenzene) because of its molar mass
Correct Answer:
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