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Which compound has the highest boiling point? A CH₃CH₂;CH₂OH B CH₃CH₂CHO C CH₃COCH₃ D CH₃COOCH₃ - AQA - A-Level Chemistry - Question 5 - 2017 - Paper 3
Question 5
Which compound has the highest boiling point? A CH₃CH₂;CH₂OH B CH₃CH₂CHO C CH₃COCH₃ D CH₃COOCH₃
Worked Solution & Example Answer:Which compound has the highest boiling point? A CH₃CH₂;CH₂OH B CH₃CH₂CHO C CH₃COCH₃ D CH₃COOCH₃ - AQA - A-Level Chemistry - Question 5 - 2017 - Paper 3
Step 1
Determine the boiling points of each compound
Answer
To determine which compound has the highest boiling point, we should consider the molecular structure and the presence of functional groups that influence boiling points such as hydrogen bonding and molecular weight.
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A: CH₃CH₂CH₂OH (1-Propanol)
Contains an -OH group allowing for hydrogen bonding, which generally increases boiling point. -
B: CH₃CH₂CHO (2-Butanal)
Is an aldehyde and does not participate in hydrogen bonding as effectively as alcohols. -
C: CH₃COCH₃ (Acetone)
Is a ketone, which has a moderate boiling point due to some polar interactions, but weaker than alcohol. -
D: CH₃COOCH₃ (Methyl Acetate)
Is an ester. It has lower boiling points compared to alcohols due to weaker dipole-dipole interactions.
Given the above analysis, compound A (1-Propanol) will have the highest boiling point due to its ability to form hydrogen bonds.
Step 2