Haloalkanes & Haloarenes
Q. What is the IUPAC name for the compound with the formula C6H5CH2Br?
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A.
Bromobenzyl
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B.
Benzyl bromide
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C.
Bromomethylbenzene
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D.
Bromobenzene
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?
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A.
Bromoethane
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B.
Ethyl bromide
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C.
Bromomethane
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D.
Ethane bromide
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?
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A.
Propene
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B.
1-Propanol
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C.
2-Propanol
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D.
No reaction
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?
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A.
2-butene
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B.
1-butene
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C.
tert-butyl bromide
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D.
butane
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?
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A.
SN1
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B.
SN2
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C.
E1
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D.
E2
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?
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A.
Phenol
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B.
Benzene
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C.
Chlorobenzene
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D.
Benzyl alcohol
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?
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A.
Bromobenzene
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B.
Benzyl bromide
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C.
Bromopropane
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D.
No reaction
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?
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A.
R
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B.
S
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C.
R and S
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D.
No stereochemistry change
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?
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A.
Elimination
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B.
Substitution
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C.
Addition
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D.
Redox
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?
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A.
Geometric isomerism
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B.
Optical isomerism
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C.
Conformational isomerism
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D.
No stereoisomerism
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?
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A.
Alcohol
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B.
Aldehyde
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C.
Halogen
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D.
Carboxylic acid
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?
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A.
C6H5Cl
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B.
C2H5Br
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C.
C3H6O
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D.
C4H10
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?
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A.
CH3Cl
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B.
C2H5Cl
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C.
C3H7Cl
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D.
C4H9Cl
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?
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A.
High reactivity towards nucleophiles
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B.
Presence of a benzene ring
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C.
Low boiling points
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D.
Solubility in water
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?
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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