Q. What is the expected major product when 2-bromobutane undergoes elimination reaction?
-
A.
But-1-ene
-
B.
But-2-ene
-
C.
But-3-ene
-
D.
Butane
Solution
The major product of the elimination reaction of 2-bromobutane is But-2-ene due to the formation of the more stable alkene.
Correct Answer:
B
— But-2-ene
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Q. What is the expected product of the reaction of 1-chlorobutane with zinc in dry ether?
-
A.
Butane
-
B.
Butyne
-
C.
Butene
-
D.
No reaction
Solution
The reaction of 1-chlorobutane with zinc in dry ether leads to the formation of Butane via Wurtz reaction.
Correct Answer:
A
— Butane
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Q. What is the expected product when 1-chlorobutane reacts with aqueous NaOH?
-
A.
Butanol
-
B.
Butene
-
C.
No reaction
-
D.
Butyric acid
Solution
The expected product is Butanol due to nucleophilic substitution with hydroxide ion.
Correct Answer:
A
— Butanol
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Q. What is the IUPAC name of CH3CH2Cl?
-
A.
Chloroethane
-
B.
Ethyl chloride
-
C.
Ethane chloride
-
D.
Chloromethane
Solution
The IUPAC name of CH3CH2Cl is Chloroethane, as it is a two-carbon alkane with a chlorine substituent.
Correct Answer:
A
— Chloroethane
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Q. What is the main product when 1-bromobutane reacts with sodium hydroxide in ethanol? (2021)
-
A.
Butanol
-
B.
Butene
-
C.
Sodium bromide
-
D.
Butyric acid
Solution
The reaction of 1-bromobutane with sodium hydroxide in ethanol leads to elimination, forming butene as the main product.
Correct Answer:
B
— Butene
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Q. What is the main type of reaction that haloalkanes undergo? (2020)
-
A.
Addition
-
B.
Substitution
-
C.
Elimination
-
D.
Redox
Solution
Haloalkanes primarily undergo nucleophilic substitution reactions due to the presence of a good leaving group (halogen).
Correct Answer:
B
— Substitution
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Q. What is the major product when 1-bromobutane reacts with sodium ethoxide? (2021)
-
A.
Butane
-
B.
Ethyl butyl ether
-
C.
1-butanol
-
D.
2-butanol
Solution
The reaction of 1-bromobutane with sodium ethoxide leads to the formation of ethyl butyl ether through an SN2 mechanism.
Correct Answer:
B
— Ethyl butyl ether
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Q. What is the major product when 2-bromobutane is treated with KOH in ethanol?
-
A.
But-1-ene
-
B.
But-2-ene
-
C.
Butane
-
D.
No reaction
Solution
The major product is But-2-ene due to the more stable double bond formed during elimination.
Correct Answer:
B
— But-2-ene
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Q. What is the product formed when 1-bromopropane reacts with sodium hydroxide in ethanol? (2021)
-
A.
Propene
-
B.
1-Propanol
-
C.
2-Propanol
-
D.
Bromopropane
Solution
1-bromopropane reacts with sodium hydroxide in ethanol to form 1-propanol through a nucleophilic substitution reaction.
Correct Answer:
B
— 1-Propanol
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Q. What is the product of the reaction between 1-bromobutane and sodium hydroxide in ethanol? (2021)
-
A.
Butanol
-
B.
Butyl bromide
-
C.
Butyl ether
-
D.
Butyric acid
Solution
The reaction of 1-bromobutane with sodium hydroxide in ethanol leads to the formation of butanol through nucleophilic substitution.
Correct Answer:
A
— Butanol
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Q. What is the product of the reaction between 1-bromopropane and sodium hydroxide in ethanol?
-
A.
Propene
-
B.
1-Propanol
-
C.
2-Propanol
-
D.
No reaction
Solution
1-bromopropane reacts with sodium hydroxide in ethanol to form 1-Propanol via nucleophilic substitution.
Correct Answer:
B
— 1-Propanol
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Q. What type of mechanism is involved in the reaction of haloalkanes with strong nucleophiles? (2020)
-
A.
SN1
-
B.
SN2
-
C.
E1
-
D.
E2
Solution
The reaction of haloalkanes with strong nucleophiles typically follows the SN2 mechanism, which involves a single concerted step.
Correct Answer:
B
— SN2
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Q. What type of mechanism is involved in the reaction of tertiary haloalkanes with nucleophiles? (2020)
-
A.
SN1
-
B.
SN2
-
C.
E1
-
D.
E2
Solution
Tertiary haloalkanes typically undergo the SN1 mechanism, which involves the formation of a carbocation intermediate.
Correct Answer:
A
— SN1
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Q. What type of reaction occurs when haloalkanes react with aqueous KOH?
-
A.
Nucleophilic substitution
-
B.
Elimination
-
C.
Addition
-
D.
Redox
Solution
Haloalkanes react with aqueous KOH primarily through nucleophilic substitution to form alcohols.
Correct Answer:
A
— Nucleophilic substitution
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Q. What type of reaction occurs when haloalkanes react with metals like magnesium?
-
A.
Substitution
-
B.
Elimination
-
C.
Addition
-
D.
Grignard formation
Solution
The reaction of haloalkanes with metals like magnesium leads to Grignard formation, which is a key step in organic synthesis.
Correct Answer:
D
— Grignard formation
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Q. What type of reaction occurs when haloalkanes react with metals like zinc?
-
A.
Substitution
-
B.
Elimination
-
C.
Reduction
-
D.
Oxidation
Solution
The reaction of haloalkanes with metals like zinc is a reduction reaction, forming alkanes.
Correct Answer:
C
— Reduction
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Q. What type of reaction occurs when haloalkanes react with nucleophiles? (2020)
-
A.
Elimination
-
B.
Substitution
-
C.
Addition
-
D.
Redox
Solution
Haloalkanes typically undergo nucleophilic substitution reactions where the halogen is replaced by a nucleophile.
Correct Answer:
B
— Substitution
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Q. Which haloalkane has the highest boiling point?
-
A.
CH3Cl
-
B.
C2H5Br
-
C.
C3H7Cl
-
D.
C4H9I
Solution
C4H9I has the highest boiling point due to the larger molecular size and stronger van der Waals forces.
Correct Answer:
D
— C4H9I
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Q. Which of the following compounds is a primary haloalkane?
-
A.
CH3CH2CH2Cl
-
B.
CH3Cl
-
C.
C2H5CCl3
-
D.
C6H5Cl
Solution
CH3CH2CH2Cl is a primary haloalkane as the carbon attached to the halogen is bonded to only one other carbon.
Correct Answer:
A
— CH3CH2CH2Cl
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Q. Which of the following haloalkanes is expected to be the most reactive in nucleophilic substitution reactions? (2023)
-
A.
Chloroethane
-
B.
Bromoethane
-
C.
Iodoethane
-
D.
Fluoroethane
Solution
Iodoethane is the most reactive due to the weaker C-I bond compared to C-Br, C-Cl, and C-F bonds.
Correct Answer:
C
— Iodoethane
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Q. Which reagent can be used to convert an alkyl halide to an alcohol?
-
A.
H2O
-
B.
NaOH
-
C.
KBr
-
D.
HCl
Solution
NaOH can be used to convert an alkyl halide to an alcohol through nucleophilic substitution.
Correct Answer:
B
— NaOH
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