Tag: hydroxy compounds and ethers

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Questions Related to hydroxy compounds and ethers

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

$\underset{Diehtyl \,ether}{C _2\,H _5\,O \,C _2 \,H _5}$       $\underset{Methyl \,n -propyl \,ether}{CH _3 \,O \,CH _2 \,CH _2 \,CH _3}$       $\underset{Methyl \,iso \,propyl \,ether}{CH _3 - O - \underset{!!!!!CH _3}{\underset{!!!!!|}{CH} -} CH _3}$
The given compounds exhibit which of the following isomerism?

  1. Chain isomerism

  2. positional isomerism

  3. Metamerism

  4. Functional isomerism
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$\underset{Diehtyl \,ether}{C _2\,H _5\,O \,C _2 \,H _5}$       $\underset{Methyl \,n -propyl \,ether}{CH _3 \,O \,CH _2 \,CH _2 \,CH _3}$       $\underset{Methyl \,iso \,propyl \,ether}{CH _3 - O - \underset{!!!!!CH _3}{\underset{!!!!!|}{CH} -} CH _3}$

The given compounds exbhit which of the following isomerism Metamerism Isomers with the same molecular formula but different alkyl groups(position of fuctional group is changing so positional isomers) (around the functional group) are called metamers. the given  ether is having the  formula $C _4H _{10}O$ has 3 metamers.

Hence option C is correct.

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

Which of the following is true regarding density?

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Increases

  2. Decreases

  3. remains same

  4. cannot be predicted
Reveal answer Fill a bubble to check yourself
A Correct answer
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$^3$.

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

Which of the following is true?

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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$^3$.

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

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

  1. Functional

  2. Metamerism

  3. Position

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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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. intermolecular hydrogen bonding in ethers

  4. intermolecular 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 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.

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

The boiling point of thioether are than those of ethers.

  1. higher

  2. lower

  3. equal

  4. nearly same
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thioethers (sulfides) have higher boiling points than their corresponding ethers because sulfur is larger and less electronegative than oxygen, leading to greater polarizability and stronger London dispersion forces.

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

Ether which is liquid at room temperature is:

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dimethyl ether (CH3-OCH3) is a gas at room temperature (bp -24 C). Ethyl methyl ether (C2H5-OCH3) has a boiling point of about 7-8 C, making it a volatile liquid at room temperature. Diethyl ether (C2H5-OC2H5) is also a liquid, but the question implies identifying a specific example.