Q. What is the effect of increasing the size of the halogen in haloalkanes on nucleophilicity?
-
A.
Increases nucleophilicity
-
B.
Decreases nucleophilicity
-
C.
No effect
-
D.
Depends on solvent
Solution
Increasing the size of the halogen generally increases nucleophilicity due to greater polarizability.
Correct Answer:
A
— Increases nucleophilicity
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Q. What is the main type of reaction that haloalkanes undergo with nucleophiles?
-
A.
Elimination
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B.
Substitution
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C.
Addition
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D.
Redox
Solution
Haloalkanes primarily undergo nucleophilic substitution reactions where the halogen is replaced by a nucleophile.
Correct Answer:
B
— Substitution
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Q. What is the primary product when 1-bromobutane reacts with sodium hydroxide in ethanol?
-
A.
Butanol
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B.
Butene
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C.
Sodium bromide
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D.
Sodium butoxide
Solution
The primary product is butanol, as the reaction involves nucleophilic substitution to replace the bromine with a hydroxyl group.
Correct Answer:
A
— Butanol
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Q. What type of hybridization is present in the carbon atom of a haloalkane?
-
A.
sp
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B.
sp2
-
C.
sp3
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D.
sp3d
Solution
The carbon atom in haloalkanes is typically sp3 hybridized, forming four sigma bonds.
Correct Answer:
C
— sp3
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Q. Which haloalkane is most likely to undergo an SN2 reaction?
-
A.
1-Bromobutane
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B.
2-Bromobutane
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C.
3-Bromobutane
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D.
Bromobenzene
Solution
1-Bromobutane is a primary haloalkane, making it more favorable for SN2 reactions compared to secondary or tertiary haloalkanes.
Correct Answer:
A
— 1-Bromobutane
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Q. Which of the following compounds is a strong nucleophile?
-
A.
Iodide ion
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B.
Bromide ion
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C.
Chloride ion
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D.
Fluoride ion
Solution
Iodide ion is a strong nucleophile due to its larger size and lower electronegativity compared to the other halides.
Correct Answer:
A
— Iodide ion
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Q. Which of the following haloalkanes has the highest boiling point?
-
A.
1-Bromopropane
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B.
1-Chloropropane
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C.
1-Iodopropane
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D.
2-Bromopropane
Solution
1-Iodopropane has the highest boiling point due to the larger size and greater polarizability of iodine compared to bromine and chlorine.
Correct Answer:
C
— 1-Iodopropane
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Q. Which of the following haloalkanes is most reactive towards nucleophilic substitution?
-
A.
1-Chloropropane
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B.
2-Chloropropane
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C.
3-Chloropropane
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D.
Bromobenzene
Solution
3-Chloropropane is a tertiary haloalkane, which is more reactive towards nucleophilic substitution due to steric hindrance.
Correct Answer:
C
— 3-Chloropropane
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Q. Which of the following is a characteristic property of haloarenes?
-
A.
Higher reactivity than haloalkanes
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B.
Undergo electrophilic substitution
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C.
Readily hydrolyze in water
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D.
Act as strong acids
Solution
Haloarenes typically undergo electrophilic substitution reactions due to the stability of the aromatic ring.
Correct Answer:
B
— Undergo electrophilic substitution
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Q. Which of the following statements about haloalkanes is true?
-
A.
They are generally more soluble in water than alcohols
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B.
They can undergo elimination reactions
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C.
They are stronger acids than alcohols
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D.
They do not react with nucleophiles
Solution
Haloalkanes can undergo elimination reactions, especially under certain conditions, leading to the formation of alkenes.
Correct Answer:
B
— They can undergo elimination reactions
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