Which of the following correctly lists the compounds in order of increasing boiling point?
A - HSC - SSCE Chemistry - Question 10 - 2023 - Paper 1
Question 10
Which of the following correctly lists the compounds in order of increasing boiling point?
A. Heptane < heptan-2-one < heptan-1-ol < heptanoic acid
B. Heptane < hept... show full transcript
Worked Solution & Example Answer:Which of the following correctly lists the compounds in order of increasing boiling point?
A - HSC - SSCE Chemistry - Question 10 - 2023 - Paper 1
Step 1
Identify the Compounds
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Answer
The compounds in question are heptane, heptan-1-ol, heptan-2-one, and heptanoic acid. Analyzing the structural features of each compound is crucial for understanding their boiling points.
Step 2
Evaluate Intermolecular Forces
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Answer
Boiling points are influenced by the types of intermolecular forces present. In general:
Heptane: Non-polar molecule with only van der Waals forces.
Heptan-2-one: Contains a ketone; its polarity is moderate due to the carbonyl group.
Heptan-1-ol: An alcohol with hydrogen bonding, leading to a higher boiling point compared to heptane and heptan-2-one.
Heptanoic acid: A carboxylic acid with both hydrogen bonding and stronger dipole-dipole interactions, resulting in the highest boiling point.
Step 3
Determine Order of Boiling Points
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Answer
Based on the analysis:
Heptane (lowest)
Heptan-2-one
Heptan-1-ol
Heptanoic acid (highest)
Thus, the correct order of increasing boiling point is: Heptane < Heptan-2-one < Heptan-1-ol < Heptanoic acid.
Step 4
Select the Correct Answer
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Answer
According to the evaluation, option A: "Heptane < heptan-2-one < heptan-1-ol < heptanoic acid" is the correct listing of the compounds in order of increasing boiling point.
