Tag: physical properties of ethers

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Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

An ether is more volatile than an alcohol having the same molecular formula. This is due to:

  1. dipolar character of ethers

  2. alcohols having resonance structures

  3. inter-molecular hydrogen bonding in ethers

  4. inter-molecular hydrogen bonding in alcohols
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An ether is more volatile than an alcohol having the same molecular formula. This is due to intermolecular hydrogen bonding in alcohols. In alcohols, $H$ atom is attached to electronegative $O$ atom. Due to this, $H$ atom of $-OH$ group of one alcohol molecule forms a hydrogen bond with $O$ atom of $-OH$ group of the second alcohol molecule. This results in the intermolecular association. It increases the boiling point and decreases the volatility of alcohol. Such inter-molecular hydrogen bonding is not possible in others as in ethers, H atom is not attached to an electronegative $O$ atom.

Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

The miscibility of ether with _______ resembles those of alcohol of the same molecular mass.

  1. methanol

  2. water

  3. DCM

  4. benzene
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The miscibility of ether with water resembles those of alcohol of the same moleculer mass. It is generally due to the hydrogen bonding with water in alcohol. So the correct option is $B$.

Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

Diethyl ether and methyl propyl ether are ___________ of each other.

  1. mesomers

  2. functional isomers

  3. none of these
  4. both $A$ and $B$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Diethyl ether $ \displaystyle CH _3-CH _2-O-CH _2-CH _3$ and Methyl propyl ether $ \displaystyle CH _3-O-CH _2-CH _2-CH _3$ are metamers of each other. They have same molecular formula but different alkyl groups attached on either side of the oxygen atom.

Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

 Least boiling point is of:

  1. ethylene glycol

  2. ether

  3. water

  4. phenol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ether has least boiling point as it cannot form hydrogen bonds. Ethylene glycol, water and phenol can form intermolecular hydrogen bonds which lead to intermolecular hydrogen bonding and high boiling points. Hydrogen bonding is possible when $H$ atom is attached to electronegative $N,\ O$ or $F$ atom.