Haloalkanes & Haloarenes
Q. What is the effect of increasing the size of the halogen atom on the reactivity of haloalkanes?
-
A.
Increases reactivity
-
B.
Decreases reactivity
-
C.
No effect
-
D.
Depends on the solvent
Solution
Increasing the size of the halogen atom generally increases the reactivity of haloalkanes due to the weaker C-X bond.
Correct Answer: A — Increases reactivity
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Q. What is the effect of increasing the size of the halogen in haloalkanes on the bond strength?
-
A.
Increases
-
B.
Decreases
-
C.
Remains the same
-
D.
Varies randomly
Solution
As the size of the halogen increases, the bond strength decreases due to the longer bond length and weaker overlap.
Correct Answer: B — Decreases
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Q. What is the main product of the reaction of 1-chloropropane with magnesium in dry ether?
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A.
Propane
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B.
Grignard reagent
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C.
Propyl chloride
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D.
Magnesium chloride
Solution
The reaction forms a Grignard reagent, which is an organomagnesium compound.
Correct Answer: B — Grignard reagent
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Q. What is the main 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.
Bromobenzyl alcohol
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D.
Benzene remains unchanged
Solution
The reaction of benzene with bromine in the presence of FeBr3 leads to the formation of bromobenzene through electrophilic aromatic substitution.
Correct Answer: A — Bromobenzene
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Q. What is the main product when 1-bromopropane reacts with magnesium in dry ether?
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A.
Propylmagnesium bromide
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B.
Propane
-
C.
Magnesium bromide
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D.
Propan-1-ol
Solution
The reaction of 1-bromopropane with magnesium in dry ether forms propylmagnesium bromide, a Grignard reagent.
Correct Answer: A — Propylmagnesium bromide
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Q. What is the main product when 1-chloropropane is treated with magnesium in dry ether?
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A.
Propane
-
B.
Propylmagnesium chloride
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C.
Cyclopropane
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D.
Chloromagnesium propyl
Solution
The reaction forms propylmagnesium chloride, a Grignard reagent.
Correct Answer: B — Propylmagnesium chloride
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Q. What is the main product when chlorobenzene is treated with sodium hydroxide at high temperature?
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A.
Phenol
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B.
Benzene
-
C.
Chlorobenzene remains unchanged
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D.
Sodium phenoxide
Solution
Chlorobenzene reacts with sodium hydroxide at high temperature to form phenol through nucleophilic aromatic substitution.
Correct Answer: A — Phenol
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Q. What is the major product of the reaction between 1-bromobutane and sodium ethoxide in ethanol?
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A.
1-ethoxybutane
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B.
2-ethoxybutane
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C.
butane
-
D.
no reaction
Solution
The reaction is an example of an SN2 reaction, where sodium ethoxide acts as a nucleophile, leading to the formation of 1-ethoxybutane.
Correct Answer: B — 2-ethoxybutane
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Q. What is the major product of the reaction between 1-bromobutane and sodium hydroxide in ethanol?
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A.
1-butanol
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B.
2-butanol
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C.
butyl bromide
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D.
butyl ether
Solution
The reaction leads to the formation of 1-butanol through an SN2 mechanism.
Correct Answer: B — 2-butanol
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Q. What is the major product of the reaction between chlorobenzene and sodium hydroxide at high temperature?
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A.
Phenol
-
B.
Benzene
-
C.
Chlorobenzene
-
D.
Sodium phenoxide
Solution
The reaction of chlorobenzene with sodium hydroxide at high temperature leads to the formation of phenol through nucleophilic substitution.
Correct Answer: A — Phenol
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Q. What is the major product of the reaction of 1-bromobutane with sodium ethoxide?
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A.
Butane
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B.
Ethyl butyl ether
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C.
1-butene
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D.
2-butene
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 1-bromobutane reacts with sodium ethoxide in ethanol?
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A.
1-ethoxybutane
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B.
2-ethoxybutane
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C.
butane
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D.
butyl ethyl ether
Solution
The reaction is an example of an SN2 reaction, leading to the formation of 1-ethoxybutane.
Correct Answer: A — 1-ethoxybutane
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Q. What is the primary product of the reaction between 1-chlorobutane and potassium cyanide?
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A.
1-cyanobutane
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B.
2-cyanobutane
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C.
Butyronitrile
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D.
Butyl cyanide
Solution
The reaction leads to the formation of 1-cyanobutane through nucleophilic substitution.
Correct Answer: A — 1-cyanobutane
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Q. What is the primary product when 1-bromo-2-methylpropane reacts with KOH in ethanol?
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A.
2-methylpropene
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B.
1-methylpropene
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C.
2-bromopropane
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D.
no reaction
Solution
The reaction leads to the formation of 2-methylpropene through an elimination reaction.
Correct Answer: A — 2-methylpropene
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Q. What is the primary product when 1-chloropropane reacts with potassium tert-butoxide?
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A.
Propene
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B.
2-methylpropane
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C.
1-butene
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D.
No reaction
Solution
The reaction of 1-chloropropane with potassium tert-butoxide leads to the formation of propene via an elimination reaction.
Correct Answer: A — Propene
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Q. What is the primary product when chlorobenzene is treated with sodium hydroxide at high temperature?
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A.
Phenol
-
B.
Benzene
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C.
Chlorobenzene
-
D.
Sodium chloride
Solution
Chlorobenzene reacts with sodium hydroxide at high temperature to form phenol.
Correct Answer: A — Phenol
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Q. What is the product of the hydrolysis of 1-chloropropane in the presence of water?
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A.
Propane
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B.
Propan-1-ol
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C.
Propan-2-ol
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D.
Chloropropane
Solution
The hydrolysis of 1-chloropropane in the presence of water yields propan-1-ol as the main product.
Correct Answer: B — Propan-1-ol
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Q. What is the product of the reaction between 1-bromopropane and sodium ethoxide?
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A.
Ethyl propyl ether
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B.
Propyl ethyl ether
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C.
1-bromo-2-ethylpropane
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D.
No reaction
Solution
The reaction of 1-bromopropane with sodium ethoxide leads to the formation of ethyl propyl ether through nucleophilic substitution.
Correct Answer: A — Ethyl propyl ether
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Q. What is the product of the reaction between 1-chlorobutane and potassium cyanide?
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A.
1-cyanobutane
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B.
2-cyanobutane
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C.
butane
-
D.
no reaction
Solution
1-cyanobutane is formed through nucleophilic substitution where the cyanide ion acts as a nucleophile.
Correct Answer: A — 1-cyanobutane
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Q. What is the product of the reaction between chlorobenzene and sodium hydroxide at high temperature?
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A.
Phenol
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B.
Benzyl alcohol
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C.
Chlorobenzene
-
D.
Sodium phenoxide
Solution
Chlorobenzene reacts with sodium hydroxide in the presence of heat to form phenol via nucleophilic substitution.
Correct Answer: A — Phenol
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Q. What is the product of the reaction of chlorobenzene with sodium hydroxide at high temperature?
-
A.
Phenol
-
B.
Benzene
-
C.
Chlorobenzene
-
D.
Sodium chloride
Solution
The reaction of chlorobenzene with sodium hydroxide at high temperature leads to the formation of phenol through nucleophilic aromatic substitution.
Correct Answer: A — Phenol
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Q. What type of isomerism is shown by 1-bromobutane and 2-bromobutane?
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A.
Structural isomerism
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B.
Geometric isomerism
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C.
Optical isomerism
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D.
Conformational isomerism
Solution
1-bromobutane and 2-bromobutane are structural isomers as they differ in the position of the bromine atom.
Correct Answer: A — Structural isomerism
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Q. What type of mechanism does the reaction of 2-bromopropane with a strong nucleophile follow?
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A.
SN1
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B.
SN2
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C.
E1
-
D.
E2
Solution
The reaction of 2-bromopropane with a strong nucleophile typically follows the SN2 mechanism due to steric hindrance.
Correct Answer: B — SN2
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Q. What type of reaction occurs when 1-bromopropane reacts with potassium cyanide?
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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 is a nucleophilic substitution where the cyanide ion replaces the bromine atom.
Correct Answer: B — Substitution
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Q. What type of reaction occurs when 2-bromobutane is treated with sodium ethoxide?
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A.
Nucleophilic substitution
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B.
Elimination
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C.
Addition
-
D.
Redox
Solution
The treatment of 2-bromobutane with sodium ethoxide leads to an elimination reaction, forming an alkene.
Correct Answer: B — Elimination
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Q. What type of reaction occurs when chlorobenzene is treated with sodium hydroxide at high temperature?
-
A.
Nucleophilic substitution
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B.
Electrophilic substitution
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C.
Elimination
-
D.
Addition
Solution
Chlorobenzene undergoes nucleophilic substitution to form phenol when treated with sodium hydroxide at high temperature.
Correct Answer: A — Nucleophilic substitution
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Q. What type of reaction occurs when haloalkanes react with alcoholic KOH?
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A.
Nucleophilic substitution
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B.
Elimination
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C.
Addition
-
D.
Redox
Solution
Haloalkanes react with alcoholic KOH primarily through nucleophilic substitution to form alcohols.
Correct Answer: B — Elimination
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Q. Which haloalkane is expected to have the highest boiling point?
-
A.
CH3Cl
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B.
C2H5Cl
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C.
C3H7Cl
-
D.
C4H9Cl
Solution
C4H9Cl (butyl chloride) has the highest molecular weight and thus the highest boiling point due to increased van der Waals forces.
Correct Answer: D — C4H9Cl
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Q. Which haloalkane is least soluble in water?
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A.
Chloroethane
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B.
Bromoethane
-
C.
Iodoethane
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D.
Fluoroethane
Solution
Iodoethane is least soluble in water due to its larger non-polar iodine atom, which decreases the overall polarity of the molecule.
Correct Answer: C — Iodoethane
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Q. Which of the following compounds can undergo elimination reaction to form an alkene?
-
A.
1-chloropropane
-
B.
2-chloropropane
-
C.
3-chloropropane
-
D.
chlorobenzene
Solution
2-chloropropane can undergo elimination to form propene, while the others are less favorable for elimination.
Correct Answer: B — 2-chloropropane
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