Alcohol, Phenol and Ether Test

Result

Alcohol, Phenol and Ether Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is not correct about the physical properties of alcohols?

A
Alcohols exist as associated molecules having intermolecular hydrogen bonds.

B
For isomeric alcohols having the same number of carbon atoms, the boiling points are in the order tertiary > secondary > primary.

C
The lower members of alcohols are colorless liquids while the higher members are colorless, odorless, wax-like solids.

D
The lower members of alcohols are highly soluble in water but the solubility decreases with increase in molecular weight.

Solution

For isomeric alcohols having the same number of carbon atoms, the boiling points are in the order primary > secondary > tertiary.
Question 2
1 / -0

Propanol has higher boiling point than propane due to

A
weak van der Waals force of attraction in propanol

B
intermolecular H-bonding in propane

C
strong van der Waals force of attraction in propane

D
strong intermolecular H-bonding in propanol

Solution

Propanol has a higher boiling point because it contains an OH (hydroxyl) group. The hydroxyl group indicates that there is strong hydrogen bonding.
Question 3
1 / -0

A mixture of o-nitrophenol and p-nitrophenol can be separated by

A
sublimation

B
steam distillation

C
distillation

D
None of these

Solution

In o-nitrophenol, there is intramolecular H-bonding and, therefore, boiling point is lowered. It is steam volatile. p-nitrophenol has intermolecular H-bonding which results in an increase in boiling point. Evidently, boiling point is higher and compound is not steam volatile. The mixture of o-nitrophenol and p-nitrophenol can be separated by steam distillation because of different boiling points.
Question 4
1 / -0

The alcohol suitable for dehydration of alcohols is

A
primary alcohol

B
secondary alcohol

C
tertiary alcohol

D
aryl alcohol

Solution

Alcohols are themselves nucleophilic. So, R−OH₂⁺ can react with ROH to produce ethers and water in a dehydration reaction. However, this reaction is rarely used, except in the manufacture of diethyl ether. Alcohol suitable for dehydration of alcohols is primary alcohol.