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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
Show solution
Solution
NaOH can be used to convert an alkyl halide to an alcohol through nucleophilic substitution.
Correct Answer:
B
— NaOH
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Showing 1 to 21 of 21 (1 Pages)
Haloalkanes MCQ & Objective Questions
Haloalkanes are a crucial topic in organic chemistry, often featured in school and competitive exams. Understanding haloalkanes not only enhances your conceptual clarity but also boosts your confidence in tackling MCQs and objective questions. Regular practice with these important questions can significantly improve your exam scores and overall performance.
What You Will Practise Here
Definition and classification of haloalkanes
Preparation methods for haloalkanes
Physical and chemical properties of haloalkanes
Reactions involving haloalkanes, including nucleophilic substitution
Applications of haloalkanes in real-world scenarios
Key diagrams illustrating haloalkane structures
Important haloalkanes questions for exams with detailed explanations
Exam Relevance
Haloalkanes frequently appear in CBSE, State Boards, NEET, and JEE exams. Students can expect questions that assess their understanding of the properties and reactions of haloalkanes. Common question patterns include multiple-choice questions that require identifying the correct reaction mechanism or predicting the products of reactions involving haloalkanes.
Common Mistakes Students Make
Confusing haloalkanes with other organic compounds like alcohols and ethers
Overlooking the importance of stereochemistry in substitution reactions
Misunderstanding the reactivity trends of different haloalkanes
Failing to apply the correct mechanism for nucleophilic substitution
FAQs
Question: What are haloalkanes?Answer: Haloalkanes are organic compounds containing carbon, hydrogen, and halogen atoms, and they play a significant role in various chemical reactions.
Question: How can I prepare for haloalkanes questions in exams?Answer: Regularly practice haloalkanes MCQ questions and review key concepts to strengthen your understanding and improve your exam readiness.
Don't miss the opportunity to enhance your knowledge! Start solving practice MCQs on haloalkanes today and test your understanding to excel in your exams.