Tag: ethers

Questions Related to ethers

Which of the following is true regarding density?

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

  1. Diethyl ether has higher density than water.

  2. Diethyl ether has lower density than water.

  3. Diethyl ether is as dense as water.

  4. The density of diethyl ether depends on its method of preparation.

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Correct Option: B
Explanation:

Diethyl ether has lower density than water. The density of diethyl ether is 713 kg/m$^3$. The density of water is 1000 kg/m$^3$.
Water molecules are closer to each other than the molecules of ether. This is due to intermolecular hydrogen bonding in water which is not possible in diethyl ether.

With increase in the molecular weight, what happens to the density of ethers?

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

  1. Increases

  2. Decreases

  3. remains same

  4. cannot be predicted

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Correct Option: A
Explanation:

With the increase in the molecular weight, the density of ethers increase.
For example, diethyl ether has a lower density than dibutyl ether.
The density of diethyl ether is 713 kg/m$^3$.
The density of dibutyl ether is 769 kg/m$^3$.

Which of the following is true?

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

  1. Diethyl ether has lower density than dibutyl ether.

  2. Diethyl ether has higher density than dibutyl ether.

  3. Diethyl ether is as dense as dibutyl ether.

  4. The relative density of diethyl ether and dibutyl ether depends on the method of their preparation.

Show answer
Correct Option: A
Explanation:

Diethyl ether has lower density than dibutyl ether.
The density of diethyl ether is 713 kg/m$^3$.
The density of dibutyl ether is 769 kg/m$^3$.

Which type of isomerism is exhibited by ${ C } _{ 2 }{ H } _{ 5 }O{ C } _{ 2 }{ H } _{ 5 }$ and $CH _3-O-\underset{CH _3}{\underset{|}{C}H}-CH _3$ ?

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

  1. Functional

  2. Metamerism

  3. Position

  4. Chain

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Correct Option: B
Explanation:

The isomerism exhibited by ${ C } _{ 2 }{ H } _{ 5 }O{ C } _{ 2 }{ H } _{ 5 }$ and $CH _3-O-\underset{CH _3}{\underset{|}{C}H}-CH _3$ is metamerism. They have same molecular formula but different alkyl groups on  either side of functional group.

Ether is less soluble in water than alcohol.
chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

  1. True

  2. False

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Correct Option: A
Explanation:

Ethers have oxygen attached to two alkyl groups ($R-\overset { .. }{ \underset { ^{ .. } }{ O }  } -R'$). Therefore, due to the high electronegativity of oxygen, it can form hydrogen-bond with water molecules similar to alcohol. But due to the absence of $H$ on $O$ of ether, they can only act as hydrogen bond acceptor (unlike alcohols) and thus have lower solubility in water than alcohols with similar molecular weight.

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

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

  1. dipolar character of ethers

  2. alcohols having resonance structures

  3. intermolecular hydrogen bonding in ethers

  4. intermolecular hydrogen bonding in alcohols

Show answer
Correct Option: D
Explanation:

An ether is more volatile than an alcohol having same molecular formula because intermolecular hydrogen bonding in alcohols. 


The $-OH$ group of alcohol can form intermolecular hydrogen bonds whereas $-O$ group of ethers cannot form hydrogen bonds. 

Hydrogen bond formation is possible when $H$ atom is attached to electronegative $N$, $O$ or $F$ atom. Intermolecular hydrogen bonds leads to molecular association. 

Hence correct answer is option D.

Ether form peroxide in contact with air and light and it may cause explosion, since the boiling point of peroxide is: 

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

  1. equal to ether

  2. lower than ether

  3. higher than ether

  4. none of these

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Correct Option: A

The boiling point of thioether are than those of ethers.

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

  1. higher

  2. lower

  3. equal

  4. nearly same

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Correct Option: A

Ether which is liquid at room temperature is:

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

  1. $C _2H _5 - O - CH _3$

  2. $CH _3 - O - CH _3$

  3. $C _2H _5 - O - C _2H _5$

  4. none of these

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Correct Option: A