Tag: alcohols, phenols and ethers

Questions Related to alcohols, phenols and ethers

An ether with formula $C _4H _{10}O$ has:

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

  1. 6 metamers

  2. 2 metamers

  3. 3 metamers

  4. 5 metamers

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Correct Option: C
Explanation:

Isomers with the same molecular formula but different alkyl groups (around the functional group) are called metamers. An ether with formula $C _4H _{10}O$ has 3 metamers.

Diethyl ether is isomeric with:

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

  1. butanol

  2. butanone

  3. methyl propyl ether

  4. All of the above

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Correct Option: A,C

Ethers exbhit which of the following isomerism(s)?

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

  1. Chain isomerism

  2. Functional isomerism

  3. Metamerism

  4. A, B &C

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Correct Option: D
Explanation:

Ethers exhibit chain isomerism ,functional isomerism, Metamerism and Chain isomerism.Ethers with the same formula and having different carbon chain skeletons are called chain isomers.

Functional isomers : Ethers are isomeric with alcohols.
Metamerism Isomers with the same molecular formula but different alkyl groups (around the functional group) are called metamers. An ether with formula $C _4H _{10}O$ has 3 metamers.

Hence option D is correct.






Which of the following isomerisms is shown by the given two compounds?

$CH _3CH _2CH _2CH _2OCH _3$      and     $CH _3-\overset{CH _3}{\overset{|}{C}H}-CH _2OCH _3$
      1-Methoxybutane                         1-Methoxy - 2 - Methylpropane

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

  1. Chain isomerism

  2. Positional isomerism

  3. Functional isomerism

  4. Metamerism

Show answer
Correct Option: D
Explanation:

The given two ethers have different carbon atoms on the two sides of a bifunctional group (-O-). Hence these are the metamers of each other.

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

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

  1. Chain isomerism

  2. positional isomerism

  3. Metamerism

  4. Functional isomerism

Show answer
Correct Option: C
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.

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.

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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

Show answer
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.