Passage II
Crude oil contains thousands of chemical compounds. To obtain commercially useful compounds, crude oil is distilled in a fractionating tower (see Figure 1). The crude oil is first heated to 400°C in a furnace, then pumped into the fractionating tower. As vapors from the oil rise, they cool and condense. Fractions are collected at different heights in the tower. Each fraction contains a mixture 'of hydrocarbon molecules with similar boiling points. Table 1 shows information about some of the fractions that can be collected. Figure 2 shows the composition of crude oils obtained in 6 different geographic locations.
Figure 1 adapted from American Chemical Society, ChemCom: Chemistry in the Community, 2nd ed. ©1993 by American Chemical Society.
Figure 2 adapted from The New Encyclopaedia Britannica. ©1986 by Encyclopaedia Britannica, Inc.
9. Based on the data in Table 1, a fraction containing a mixture of hydrocarbons ranging in size from 8 to 14 carbon atoms per molecule would most likely have a boiling range:
Your Answer is
Correct Answer is C
Explanation
According to table 1, it can be seen that the more carbon atoms, the higher the boiling range. So when it contains 8-14 carbon atoms, the boiling range should be between 40-200 and 200-300, and the 100-250 of option C is in line