chemistry : class12 Water solubility : Physical properties of haloalkanes : Haloalkanes and Haloarenes MCQ Questions and Answers
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Water solubility
MCQ questions and answers.
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MCQ Questions
1. What is the general solubility of haloalkanes in water?
A.
Highly soluble
B.
Slightly soluble
C.
Completely insoluble in every case
D.
More soluble than sugars
Correct Answer:
Slightly soluble
Explanation:
Haloalkanes are only slightly soluble in water because they cannot form strong hydrogen bonds with water molecules.
2. Why are haloalkanes generally insoluble or only slightly soluble in water?
A.
They form strong ionic bonds with water
B.
They cannot form strong hydrogen bonds with water
C.
They decompose immediately in water
D.
They have very high melting points
Correct Answer:
They cannot form strong hydrogen bonds with water
Explanation:
Although haloalkanes contain a polar carbon–halogen bond, they do not form strong hydrogen bonds with water, so their water solubility is low.
3. Which of the following is expected to be more soluble in water?
A.
Chloroethane
B.
Bromoethane
C.
Iodoethane
D.
Hexyl chloride
Correct Answer:
Chloroethane
Explanation:
Among the listed haloalkanes, chloroethane has the smallest carbon chain and generally has greater water solubility than the larger haloalkanes.
4. What happens to the water solubility of a homologous series of haloalkanes as the carbon chain becomes longer?
A.
It generally increases
B.
It generally decreases
C.
It remains exactly unchanged
D.
It becomes infinite
Correct Answer:
It generally decreases
Explanation:
As the hydrocarbon portion becomes larger, the nonpolar character of the haloalkane increases, causing its solubility in water to generally decrease.
5. Which compound is expected to have greater water solubility?
A.
Chloromethane
B.
Chloroethane
C.
Chloropropane
D.
Chlorobutane
Correct Answer:
Chloromethane
Explanation:
Chloromethane has the smallest hydrocarbon part among the given compounds, so it is expected to have the greatest water solubility.
6. Compared with ethanol, chloroethane is generally:
A.
Much more soluble in water
B.
Less soluble in water
C.
Equally soluble in water
D.
Converted into water
Correct Answer:
Less soluble in water
Explanation:
Ethanol can form strong hydrogen bonds with water through its hydroxyl group, whereas chloroethane cannot, making chloroethane less soluble.
7. Which interaction mainly helps a haloalkane dissolve to a small extent in water?
A.
Weak dipole–dipole attraction with water
B.
Formation of a strong ionic lattice
C.
Formation of metallic bonds
D.
Complete conversion into hydrogen bonds
Correct Answer:
Weak dipole–dipole attraction with water
Explanation:
The polar carbon–halogen bond allows weak dipole–dipole attractions with water, giving haloalkanes limited water solubility.
8. Which of the following haloalkanes is expected to be least soluble in water?
A.
Chloromethane
B.
Chloroethane
C.
Chloropropane
D.
Chlorohexane
Correct Answer:
Chlorohexane
Explanation:
Chlorohexane has the largest nonpolar hydrocarbon portion among the options, so it is expected to have the lowest water solubility.
9. Haloalkanes do not dissolve readily in water mainly because their hydrocarbon part is:
A.
Nonpolar
B.
Strongly ionic
C.
Made only of hydrogen bonds
D.
Metallic
Correct Answer:
Nonpolar
Explanation:
The hydrocarbon portion of a haloalkane is nonpolar and does not interact strongly with polar water, resulting in low solubility.
10. Which statement about the water solubility of haloalkanes is correct?
A.
They are generally more soluble than corresponding alcohols
B.
They are generally less soluble than corresponding alcohols
C.
They are all completely miscible with water
D.
Their solubility is independent of molecular size
Correct Answer:
They are generally less soluble than corresponding alcohols
Explanation:
Alcohols have hydroxyl groups that form hydrogen bonds with water, while haloalkanes lack such groups and are therefore generally less soluble.
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