Question

Assertion: Dimethyl ether and diethylether are soluble in water. Reason: As the molecular mass increases, solubility of ethers in water decreases

Answer 1

Answer:

Ethers ROR cannot form intermolecular Hydrogen bond due to the absence of H attached with the electronegative atom as N/O/F, but in case of alcohols, they have -OH which can undergo intermolecular hydrogen bonding and that increases their boiling point.

Thus, Ethers have lower boiling points than their corresponding isomeric alcohols because of hydrogen bonding in alcohols that is absent in ethers due to low polarity.

Explanation:

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Answer 2

Dimethyl ether is soluble in water while diethyl ether is sparingly soluble in water. As the molecular mass increases, the solubility of ethers in water decreases. Therefore, the assertion is incorrect but the reason is correct.

Explanation:

• The solubility of ether depends upon the molecular mass of the ethers or the number of carbon atoms.
• As the number of carbon atoms or the molecular mass of the ethers increases, the solubility of ethers in water decreases.
• Ethers up to three carbon atoms are soluble in water due to the formation of hydrogen bonds in water.
• As the molecular mass or the number of carbon atoms increases, the hydrocarbon part of the ether increases which decreases the extent of hydrogen bond formation.
• Therefore, the solubility of the ethers decreases with increases in molecular mass.
• Dimethyl ether has only two carbon atoms, therefore, it is soluble in water.
• On the other hand, diethyl ether has four carbon atoms, therefore, it is sparingly soluble in water.