Question detail
What is the relationship between the chain length of hydrocarbons and their boiling points?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Alkanes
Question
- A. Longer chain hydrocarbons have lower boiling points.
- B. Longer chain hydrocarbons have higher boiling points.
- C. Chain length does not affect boiling points.
- D. All hydrocarbons have the same boiling point.
Answer
Longer chain hydrocarbons have higher boiling points.
Explanation
As the chain length of hydrocarbons increases, the intermolecular forces, specifically van der Waals forces, also increase. This leads to higher boiling points due to the greater energy required to overcome these forces.
Common mistake
Misunderstanding Fraction Properties
Students often confuse the relationship between chain length and boiling point, thinking that longer chains always have lower boiling points.
To clarify, remember that as chain length increases, the boiling point generally increases due to stronger van der Waals forces. For example, consider the formula for boiling point trends: longer chains lead to increased surface area, which enhances intermolecular forces. Thus, longer alkanes have higher boiling points. Always relate this to the strength of intermolecular forces.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.