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.
8. According to the information in Table 1, hydrocarbon molecules each having 14 carbon atoms would most likely be found in which of the following fractions?
Your Answer is
Correct Answer is G
Explanation
The question stem always requires 14 carbon atoms, see table 1, the number of carbon atoms in each molecule of Kerosene is 12-16, which meets the question stem requirement