C. Melting or Boiling Point of Hydrocarbons. Example: Cyclooctane Cyclopentane 1. Нехапе Octane 2. Cyclohexane Нехane 3. Methane Ethane 4. Pentane Cyclooctane 5. Cyclobutane Cycloheptane 6. 2-Нехепe 2-Octene 7. Cyclobutene Cyclooctene
Melting or Boiling Point of Hydrocarbons
Procedure:
- In the picture below, ENCIRCLE the compound that has higher boiling point or melting point for each of the following pairs.
- The longer the hydrocarbon chain or ring size the higher the melting or boiling points. 3. Cyclic structures have higher boiling or melting points than their non-cyclic counterparts with the same number of carbon atoms. These differences are due in large part to cyclic systems having more rigid and more symmetrical structures.
Example:
o Propane has higher melting or boiling point compared to ethane because propane has longer hydrocarbon chain which is composed of 3 carbon atoms in contrast to ethane which is composed only of 2 carbon atoms.
o Cyclopentene has higher melting or boiling point compared to cyclobutene because cyclopentene has larger ring size which is composed of 5 carbon atoms in contrast to cyclobutene which is composed only of 4 carbon atoms.
o Cyclopropane has higher melting or boiling point compared to propane because cyclic structures have higher boiling or melting points than their non-cyclic counterparts with the same number of carbon atoms. These differences are due in large part to cyclic systems having more rigid and more symmetrical structures.
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