Place these hydrocarbons in order of decreasing boiling point:
paraffin, ,
ethane, ,
hexane, ,
neohexane, (also known as 2,2-dimethylbutane), and
octadecane, ,
Concepts and reason
The concept used to solve this problem is based on boiling point.
The boiling point hydrocarbons is mainly dependent on branching, intermolecular forces, and number of carbons.
Fundamentals
The temperature at which the vapor pressure of the liquid is equal to the environmental pressure neighboring the liquid is called boiling point of the liquid.
The trends, which affect the boiling point are branching, intermolecular forces, and number of carbons. Boiling point depends on the surface area of the molecule. Higher the surface area, higher is the boiling point. The strength of forces like hydrogen bonding, ionic bonding, dipole-dipole interaction affects the boiling point. Moreover, the length of carbon chain also affects the boiling point.
Answer:
The decreasing order of surface area of mention compounds is written as follows:
Explanation:
In hydrocarbon, the boiling point directly varies with the length of carbon chain. On increasing the number of carbon atom, the boiling point of the compound also increases. Paraffin contains highest number of carbon atoms whereas, ethane is comprised of two carbon atoms.
The decreasing order of boiling point of mention compounds is written as follows:
Explanation:
The boiling point of a compound is directly proportional to its surface area. Larger the surface area, more intermolecular forces that occur over the surface. Thus, higher the boiling point.