Q. What is the effect of increasing the size of the halogen atom on the bond strength of haloalkanes? (2021)
A.
Increases bond strength
B.
Decreases bond strength
C.
No effect
D.
Increases reactivity
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Solution
As the size of the halogen atom increases, the bond length increases, leading to a decrease in bond strength.
Correct Answer: B — Decreases bond strength
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Q. What is the effect of increasing the size of the halogen in haloalkanes on the reactivity? (2023)
A.
Increases reactivity
B.
Decreases reactivity
C.
No effect
D.
Reactivity depends on the solvent
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Solution
Increasing the size of the halogen decreases the bond strength, thus increasing the reactivity of haloalkanes in nucleophilic substitution.
Correct Answer: A — Increases reactivity
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Q. What is the main product of the reaction of 1-bromo-2-methylpropane with KOH in ethanol? (2020)
A.
2-methylpropene
B.
2-methylpropan-1-ol
C.
1-bromo-2-methylpropane
D.
2-bromo-2-methylpropane
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Solution
The reaction of 1-bromo-2-methylpropane with KOH in ethanol leads to the formation of 2-methylpropene through an elimination reaction.
Correct Answer: A — 2-methylpropene
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Q. What is the main product when 1-bromopropane is treated with alcoholic KOH? (2021)
A.
Propene
B.
1-propanol
C.
2-propanol
D.
Bromopropane
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Solution
Alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-bromopropane.
Correct Answer: A — Propene
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Q. What is the main product when 1-bromopropane is treated with magnesium in dry ether? (2019)
A.
Propane
B.
Grignard reagent
C.
Bromopropane
D.
Propyl alcohol
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Solution
The reaction of 1-bromopropane with magnesium in dry ether forms the Grignard reagent, propylmagnesium bromide.
Correct Answer: B — Grignard reagent
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Q. What is the main product when 1-chloropropane is treated with alcoholic KOH? (2019)
A.
Propene
B.
Propan-1-ol
C.
Propan-2-ol
D.
Chloropropane
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Solution
Alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-chloropropane.
Correct Answer: A — Propene
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Q. What is the main product when 1-chloropropane is treated with aqueous KOH? (2019)
A.
Propene
B.
Propan-1-ol
C.
Propan-2-ol
D.
Chloropropane
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Solution
The treatment of 1-chloropropane with aqueous KOH leads to the formation of propan-1-ol through nucleophilic substitution.
Correct Answer: B — Propan-1-ol
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Q. What is the main product when 1-chloropropane is treated with excess alcoholic KOH? (2020)
A.
Propene
B.
1-Propanol
C.
2-Propanol
D.
Chloropropane
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Solution
Excess alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-chloropropane.
Correct Answer: A — Propene
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Q. What is the major product of the reaction of 1-bromobutane with sodium hydroxide in ethanol? (2019)
A.
Butanol
B.
Butene
C.
Butyl bromide
D.
Sodium bromide
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Solution
The reaction of 1-bromobutane with sodium hydroxide in ethanol leads to elimination, forming butene as the major product.
Correct Answer: B — Butene
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Q. What is the product of the reaction between 1-bromobutane and sodium ethoxide in ethanol? (2020)
A.
Butane
B.
Ethyl butanoate
C.
Butyl ethyl ether
D.
1-Butanol
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Solution
The reaction of 1-bromobutane with sodium ethoxide leads to the formation of butyl ethyl ether through an SN2 mechanism.
Correct Answer: C — Butyl ethyl ether
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Q. What type of reaction occurs when 1-bromopropane reacts with sodium cyanide? (2023)
A.
Elimination
B.
Substitution
C.
Addition
D.
Redox
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Solution
The reaction between 1-bromopropane and sodium cyanide is a nucleophilic substitution reaction, resulting in the formation of propanenitrile.
Correct Answer: B — Substitution
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Q. What type of reaction occurs when 1-bromopropane reacts with sodium ethoxide? (2023)
A.
Elimination
B.
Nucleophilic substitution
C.
Addition
D.
Oxidation
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Solution
The reaction of 1-bromopropane with sodium ethoxide is a nucleophilic substitution reaction where the ethoxide ion replaces the bromine atom.
Correct Answer: B — Nucleophilic substitution
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Q. What type of reaction occurs when 1-chlorobutane is treated with aqueous KOH? (2023)
A.
Elimination
B.
Substitution
C.
Addition
D.
Redox
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Solution
When 1-chlorobutane is treated with aqueous KOH, a nucleophilic substitution reaction occurs, resulting in the formation of butanol.
Correct Answer: B — Substitution
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Q. What type of reaction occurs when 1-chloropropane is treated with aqueous KOH? (2019)
A.
Nucleophilic substitution
B.
Elimination
C.
Addition
D.
Redox
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Solution
The reaction of 1-chloropropane with aqueous KOH leads to nucleophilic substitution, resulting in the formation of propanol.
Correct Answer: A — Nucleophilic substitution
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Q. What type of reaction occurs when 1-chloropropane reacts with aqueous KOH? (2023)
A.
Elimination
B.
Substitution
C.
Addition
D.
Redox
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Solution
The reaction of 1-chloropropane with aqueous KOH leads to an elimination reaction, forming propene.
Correct Answer: B — Substitution
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Q. What type of reaction occurs when 1-chloropropane reacts with potassium cyanide? (2019)
A.
Nucleophilic substitution
B.
Electrophilic substitution
C.
Addition reaction
D.
Elimination reaction
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Solution
The reaction between 1-chloropropane and potassium cyanide is a nucleophilic substitution reaction, resulting in the formation of propanenitrile.
Correct Answer: A — Nucleophilic substitution
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Q. What type of reaction occurs when 1-chloropropane reacts with sodium cyanide? (2023)
A.
Elimination
B.
Nucleophilic substitution
C.
Addition
D.
Redox
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Solution
The reaction between 1-chloropropane and sodium cyanide is a nucleophilic substitution reaction where the cyanide ion replaces the chlorine atom.
Correct Answer: B — Nucleophilic substitution
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Q. What type of reaction occurs when 1-chloropropane reacts with sodium iodide in acetone? (2023)
A.
Elimination
B.
Nucleophilic substitution
C.
Addition
D.
Redox
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Solution
The reaction is a nucleophilic substitution (S_N2) where iodide ion replaces the chlorine atom.
Correct Answer: B — Nucleophilic substitution
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Q. What type of reaction occurs when 2-bromopropane is treated with aqueous KOH? (2023)
A.
Elimination
B.
Substitution
C.
Addition
D.
Redox
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Solution
The reaction of 2-bromopropane with aqueous KOH leads to an elimination reaction, forming propene.
Correct Answer: A — Elimination
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Q. What type of reaction occurs when chlorobenzene is treated with magnesium in dry ether? (2019)
A.
Grignard reaction
B.
Nucleophilic substitution
C.
Electrophilic substitution
D.
Reduction reaction
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Solution
The reaction of chlorobenzene with magnesium in dry ether forms a Grignard reagent, which is a key step in organic synthesis.
Correct Answer: A — Grignard reaction
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Q. Which haloalkane is most likely to undergo elimination reactions? (2023)
A.
1-bromopropane
B.
2-bromobutane
C.
3-bromobutane
D.
Bromobenzene
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Solution
3-bromobutane is more likely to undergo elimination reactions due to the presence of a tertiary carbon.
Correct Answer: C — 3-bromobutane
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Q. Which of the following compounds is an aryl halide? (2019)
A.
Chloroethane
B.
Bromobenzene
C.
Iodobutane
D.
Chloropropane
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Solution
Bromobenzene is an aryl halide as it contains a halogen atom bonded to an aromatic ring.
Correct Answer: B — Bromobenzene
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Q. Which of the following compounds is an example of a haloarene? (2019)
A.
Chloroethane
B.
Bromobenzene
C.
Iodobutane
D.
Chloropropane
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Solution
Bromobenzene is a haloarene as it contains a halogen atom directly attached to an aromatic ring.
Correct Answer: B — Bromobenzene
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Q. Which of the following compounds is least reactive in nucleophilic substitution reactions? (2023)
A.
1-bromopropane
B.
2-bromopropane
C.
3-bromopropane
D.
Benzyl bromide
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Solution
Benzyl bromide is less reactive in nucleophilic substitution due to the resonance stabilization of the benzyl cation formed during the reaction.
Correct Answer: D — Benzyl bromide
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Q. Which of the following compounds is least soluble in water? (2022)
A.
Chloroethane
B.
Bromobenzene
C.
Iodopropane
D.
Chlorobenzene
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Solution
Bromobenzene is least soluble in water due to its non-polar nature and the presence of the aromatic ring.
Correct Answer: B — Bromobenzene
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Q. Which of the following haloalkanes can undergo elimination reaction more readily? (2023)
A.
1-bromopropane
B.
2-bromopropane
C.
3-bromopropane
D.
Bromobenzene
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Solution
Tertiary haloalkanes like 3-bromopropane can undergo elimination reactions more readily due to the stability of the resulting alkene.
Correct Answer: C — 3-bromopropane
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Q. Which of the following haloalkanes can undergo elimination reaction to form an alkene? (2021)
A.
1-bromopropane
B.
2-bromobutane
C.
Bromobenzene
D.
Chloroethane
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Solution
2-bromobutane can undergo elimination to form an alkene due to the presence of a beta-hydrogen.
Correct Answer: B — 2-bromobutane
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Q. Which of the following haloalkanes can undergo elimination to form an alkene? (2021)
A.
1-bromopropane
B.
2-bromobutane
C.
Bromobenzene
D.
Chloroethane
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Solution
2-bromobutane can undergo elimination to form an alkene due to the presence of a beta-hydrogen.
Correct Answer: B — 2-bromobutane
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Q. Which of the following haloalkanes is most likely to undergo elimination rather than substitution? (2020)
A.
1-bromobutane
B.
2-bromobutane
C.
3-bromobutane
D.
Bromobenzene
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Solution
3-bromobutane is more likely to undergo elimination due to steric hindrance, favoring the formation of alkenes.
Correct Answer: C — 3-bromobutane
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Q. Which of the following haloalkanes will undergo nucleophilic substitution most readily? (2022)
A.
1-chloropropane
B.
2-chloropropane
C.
3-chloropropane
D.
Bromobenzene
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Solution
Tertiary haloalkanes like 3-chloropropane undergo nucleophilic substitution more readily due to steric hindrance and the stability of the carbocation formed during the reaction.
Correct Answer: C — 3-chloropropane
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