Three physical properties shown below beside different alkane series. Which of the series is(are) listed in the order of increase (lowest to highest) for the corresponding property?Group of answer choicesAll are ranked correctly.Density: C4H10 < C5H12 < C8H18Boiling Point: C5H12 < C4H10 < C8H18Melting Point: C8H18 < C5H12 < C4H10
Question
Three physical properties shown below beside different alkane series. Which of the series is(are) listed in the order of increase (lowest to highest) for the corresponding property?Group of answer choicesAll are ranked correctly.Density: C4H10 < C5H12 < C8H18Boiling Point: C5H12 < C4H10 < C8H18Melting Point: C8H18 < C5H12 < C4H10
Solution
The correct answer is "Density: C4H10 < C5H12 < C8H18".
Here's why:
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Density: The density of a substance generally increases with the increase in the molecular weight. In the given series, C4H10 (Butane) has the lowest molecular weight, followed by C5H12 (Pentane), and then C8H18 (Octane) which has the highest molecular weight. Therefore, the density should increase in the order C4H10 < C5H12 < C8H18.
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Boiling Point: The boiling point of alkanes also increases with the increase in the molecular weight. However, in the given series, C5H12 (Pentane) is listed before C4H10 (Butane), which is incorrect. The correct order should be C4H10 < C5H12 < C8H18.
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Melting Point: Similar to boiling point, the melting point of alkanes also increases with the increase in the molecular weight. In the given series, C8H18 (Octane) is listed before C5H12 (Pentane) and C4H10 (Butane), which is incorrect. The correct order should be C4H10 < C5H12 < C8H18.
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