Which is more stable: cyclobutane or cycloheptane?

In summary, cyclobutane and cycloheptane are both cyclic hydrocarbons with different ring sizes. Cycloheptane is more stable than cyclobutane due to its larger ring size and lower ring strain. This higher stability also makes cycloheptane less reactive compared to cyclobutane. The stability of these compounds is influenced by factors such as ring strain, bond angles, and steric hindrance. These properties also impact their physical properties, as cycloheptane has a lower boiling point, melting point, and vapor pressure due to its higher stability.
  • #1
AMan24
58
2

Homework Statement


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Which is more stable cyclobutane or cycloheptane?

Homework Equations


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[(n-2)180)]/n = angle

The Attempt at a Solution


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So the closer the angle is to 109.5 the more stable (except for cyclopentane vs cyclohexane).
n = number of carbons

[(7-2)180)]/7 = 128.57, 128.57 - 109.5 = 19.07

[(4-2)180)]/4 = 90, 109.5 - 90 = 19.5

cycloheptane is closer to 109.5 so its more stable?
 
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  • #2
Are cyclobutane and cycloheptane planar?
 

1. What is the difference between cyclobutane and cycloheptane?

Cyclobutane and cycloheptane are both cyclic hydrocarbons with different ring sizes. Cyclobutane has a four-membered ring while cycloheptane has a seven-membered ring.

2. Which one is more stable: cyclobutane or cycloheptane?

Cycloheptane is more stable than cyclobutane. This is because cycloheptane has a larger ring size, which allows for more staggered conformations and reduces the angle strain within the ring.

3. How does the stability of cyclobutane and cycloheptane affect their reactivity?

The stability of cyclobutane and cycloheptane influences their reactivity. Cycloheptane is more stable, making it less reactive compared to cyclobutane. This is because cycloheptane has lower energy conformations and requires more energy to undergo reactions.

4. What factors contribute to the stability of cyclobutane and cycloheptane?

The stability of cyclobutane and cycloheptane is influenced by several factors, including ring strain, bond angles, and steric hindrance. In cyclobutane, the small ring size leads to significant ring strain and unfavorable bond angles, making it less stable. In contrast, the larger ring size of cycloheptane reduces ring strain and allows for more favorable bond angles, making it more stable.

5. How does the stability of cyclobutane and cycloheptane impact their physical properties?

The stability of cyclobutane and cycloheptane affects their physical properties. Cycloheptane's higher stability results in a lower boiling point, melting point, and vapor pressure compared to cyclobutane. This is because more energy is needed to break the stronger bonds in cycloheptane, making it less volatile.

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