Q. What is the IUPAC name for the compound with the formula C6H5CH2Br?
A.
Bromobenzyl
B.
Benzyl bromide
C.
Bromomethylbenzene
D.
Bromobenzene
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Solution
The correct IUPAC name for C6H5CH2Br is Benzyl bromide, as it consists of a benzyl group with a bromine substituent.
Correct Answer:
B
— Benzyl bromide
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Q. What is the IUPAC name of CH3CH2Br?
A.
Bromoethane
B.
Ethyl bromide
C.
Bromomethane
D.
Ethane bromide
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Solution
The correct IUPAC name for CH3CH2Br is Bromoethane, as it consists of a two-carbon chain with a bromine substituent.
Correct Answer:
A
— Bromoethane
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Q. What is the major 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
The major product is 1-Propanol, as the reaction proceeds via an SN2 mechanism leading to the formation of an alcohol.
Correct Answer:
B
— 1-Propanol
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Q. What is the major product of the reaction between 2-bromobutane and potassium tert-butoxide?
A.
2-butene
B.
1-butene
C.
tert-butyl bromide
D.
butane
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Solution
The major product is 2-butene, as potassium tert-butoxide promotes elimination (E2) leading to the formation of an alkene.
Correct Answer:
A
— 2-butene
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Q. What is the mechanism of the reaction of 2-bromobutane with potassium cyanide?
A.
SN1
B.
SN2
C.
E1
D.
E2
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Solution
The reaction proceeds via an SN2 mechanism, as 2-bromobutane is a secondary haloalkane and the nucleophile attacks from the opposite side.
Correct Answer:
B
— SN2
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Q. What is the product of the hydrolysis of chlorobenzene?
A.
Phenol
B.
Benzene
C.
Chlorobenzene
D.
Benzyl alcohol
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Solution
The hydrolysis of chlorobenzene primarily yields phenol, as the chlorine atom is replaced by a hydroxyl group.
Correct Answer:
A
— Phenol
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Q. What is the product of the reaction of benzene with bromine in the presence of FeBr3?
A.
Bromobenzene
B.
Benzyl bromide
C.
Bromopropane
D.
No reaction
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Solution
The product is Bromobenzene, as the reaction involves electrophilic aromatic substitution.
Correct Answer:
A
— Bromobenzene
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Q. What is the stereochemistry of the product formed from the reaction of (R)-2-bromobutane with sodium iodide in acetone?
A.
R
B.
S
C.
R and S
D.
No stereochemistry change
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Solution
The reaction leads to inversion of configuration, resulting in the formation of (S)-2-iodobutane.
Correct Answer:
B
— S
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Q. What type of reaction occurs when a haloalkane reacts with a nucleophile?
A.
Elimination
B.
Substitution
C.
Addition
D.
Redox
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Solution
The reaction of a haloalkane with a nucleophile typically results in a substitution reaction, where the nucleophile replaces the halogen.
Correct Answer:
B
— Substitution
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Q. What type of stereoisomerism is exhibited by 1,2-dibromopropane?
A.
Geometric isomerism
B.
Optical isomerism
C.
Conformational isomerism
D.
No stereoisomerism
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Solution
1,2-Dibromopropane exhibits optical isomerism due to the presence of a chiral center.
Correct Answer:
B
— Optical isomerism
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Q. Which functional group is present in haloalkanes?
A.
Alcohol
B.
Aldehyde
C.
Halogen
D.
Carboxylic acid
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Solution
Haloalkanes contain a halogen functional group, which is responsible for their reactivity and properties.
Correct Answer:
C
— Halogen
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Q. Which of the following compounds is a haloalkane?
A.
C6H5Cl
B.
C2H5Br
C.
C3H6O
D.
C4H10
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Solution
C2H5Br is a haloalkane, as it contains a carbon chain with a bromine atom attached.
Correct Answer:
B
— C2H5Br
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Q. Which of the following haloalkanes has the highest boiling point?
A.
CH3Cl
B.
C2H5Cl
C.
C3H7Cl
D.
C4H9Cl
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Solution
C4H9Cl has the highest boiling point due to increased molecular weight and surface area leading to stronger van der Waals forces.
Correct Answer:
D
— C4H9Cl
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Q. Which of the following is a characteristic feature of haloarenes?
A.
High reactivity towards nucleophiles
B.
Presence of a benzene ring
C.
Low boiling points
D.
Solubility in water
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Solution
Haloarenes are characterized by the presence of a benzene ring, which affects their reactivity and properties.
Correct Answer:
B
— Presence of a benzene ring
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Q. Which of the following is the correct mechanism for the reaction of 1-bromopropane with sodium hydroxide?
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Solution
The reaction of 1-bromopropane with sodium hydroxide proceeds via an S2 mechanism, which is a bimolecular nucleophilic substitution.
Correct Answer:
D
— S2
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Showing 1 to 15 of 15 (1 Pages)
This chapter covers the structure, properties, preparation, and reactions of haloalkanes and haloarenes , which are key classes of organic compounds containing halogen substituents. It is a core topic in Class 12 chemistry , essential for competitive exam aspirants and undergraduate learners , forming the foundation for understanding substitution, elimination, and coupling reactions.
In this section, you will study:
Classification and nomenclature of haloalkanes and haloarenes
Nature of the carbon–halogen bond and its reactivity
Preparation methods of haloalkanes and haloarenes
Physical and chemical properties
Nucleophilic substitution reactions (SN1 and SN2 mechanisms)
Elimination reactions and competition with substitution
Reactions of haloarenes and their relative reactivity
Uses, environmental effects, and safety considerations
NCERT-aligned explanations, reaction mechanisms, MCQs, and exam-oriented questions
The content is structured to build mechanistic understanding , enhance reaction analysis skills , and prepare students for school examinations, NEET, JEE, and undergraduate assessments .
Develop a strong command over haloalkanes and haloarenes to confidently analyze reaction pathways, predict products, and solve mechanism-based organic chemistry problems.