The correct order of boiling points of N-ethylethanamine(I), ethoxyethane(II) and butan-2-ol(III) is
- III<II<I
- II<III<I
- II<I<III
- III<I<II
The Correct Option is C
Solution and Explanation
Butan-2-ol exhibits stronger hydrogen bonding compared to N-ethylethanamine. On the other hand, ethoxyethane displays dipole interactions, which are weaker than hydrogen bonding. Therefore, the order is :
ethoxyethane < N-ethylethanamine < butan-2-ol.
So, the corrrect option is (C) : II<I<III
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Concepts Used:
Physical Properties - Alcohols, Phenols and Ethers
Alcohols, phenols, and ethers are organic compounds that exhibit a range of physical properties.
Physical Properties of Alcohols:
Alcohols are generally colorless, flammable liquids or solids with a characteristic odor. They have higher boiling points than hydrocarbons of comparable molecular weight due to hydrogen bonding between the hydroxyl groups. Alcohols also exhibit higher viscosity and surface tension than hydrocarbons. Alcohols are soluble in water due to the formation of hydrogen bonds between the hydroxyl groups and water molecules.
Physical Properties of Phenols:
Phenols are generally colorless to light pink or brown, crystalline solids with a distinctive odor. They have higher boiling points than hydrocarbons of comparable molecular weight due to hydrogen bonding between the hydroxyl groups. Phenols are less soluble in water than alcohols due to the lack of a second hydroxyl group for hydrogen bonding. They are, however, soluble in organic solvents.
Also Read: Physical and Chemical Properties of Alcohol
Physical Properties of Ethers:
Ethers are generally colorless, flammable liquids or gases with a characteristic odor. They have lower boiling points than alcohols of comparable molecular weight due to the absence of hydrogen bonding. Ethers are also less polar than alcohols and are less soluble in water. They are, however, more soluble in organic solvents than alcohols.
In summary, alcohols, phenols, and ethers exhibit a range of physical properties that depend on their molecular structure and functional groups. Understanding these physical properties is important for predicting the behavior of these compounds in various applications, such as in the production of solvents, fuels, and pharmaceuticals.