Tag: alcohols, phenols and ethers

Questions Related to alcohols, phenols and ethers

With ethoxyethane which compound is miscible to almost the same extent?

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

  1. Formaldehyde

  2. Bhutanone

  3. Butan-1-ol

  4. Propan-1-ol

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Correct Option: C
Explanation:

The correct option is $C$. Ethoxyethane is an ether group which is miscible to the alcohol that is Butan $-1-$ol. This is because they have the same molecular mass. 

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. inter-molecular hydrogen bonding in ethers

  4. inter-molecular hydrogen bonding in alcohols

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Correct Option: D
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.

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

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

  1. methanol

  2. water

  3. DCM

  4. benzene

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Correct Option: B
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 $B$.

In iodine charge transfer test the color of ether compound formed is:

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

  1. blue

  2. pale yello

  3. brown

  4. dark red

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Correct Option: C
Explanation:
The correct option is $C$. Ether forms charge transfer complexes with Iodine to give a brown solution.
$R-O-R'\longrightarrow R'I-+RI+H _2O$

Which of the following is soluble in water?

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

  1. $CS _2$

  2. $CH _3OCH _3$

  3. $C _2H _5-CO-C _2H _5$

  4. $CCl _4$

Show answer
Correct Option: B
Explanation:

The correct option is $B$. The lower number of ether is soluble in water. So dimethyl ether compound is generally soluble in water. 

The lower ether are highly volatile and flammable.

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:

In case of ether there is no intermolecular forces which results in low boiling points or high vapour pressures. Hence lower ethers are highly volatile and flammable.

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:

The correct option is $A$. Ether is less soluble than alcohol in water because alcohol forms hydrogen bond with water molecule but ether does not.

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

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

  1. mesomers

  2. functional isomers

  3. none of these

  4. both $A$ and $B$

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Correct Option: C
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.

 Least boiling point is of:

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

  1. ethylene glycol

  2. ether

  3. water

  4. phenol

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Correct Option: B
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.

All ethers are lighter than _________.

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

  1. benzene

  2. phenol

  3. acetone

  4. water

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Correct Option: D
Explanation:

The density of ether increases gradually with increase in the molecular mass. But their density is less than 1. And we know that the density of water is 1. Hence all ethers are lighter than water.