Organic Chemistry - Haloalkanes & Haloarenes

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Q1. What is the main product when 1-chloropropane is treated with aqueous KOH? (2019)

Solution:

The treatment of 1-chloropropane with aqueous KOH leads to the formation of propan-1-ol through nucleophilic substitution.

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Q2. What is the effect of increasing the size of the halogen in haloalkanes on the reactivity? (2023)

Solution:

Increasing the size of the halogen decreases the bond strength, thus increasing the reactivity of haloalkanes in nucleophilic substitution.

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Q3. What is the major product of the reaction of 1-bromobutane with sodium hydroxide in ethanol? (2019)

Solution:

The reaction of 1-bromobutane with sodium hydroxide in ethanol leads to elimination, forming butene as the major product.

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Q4. What is the main product when 1-chloropropane is treated with excess alcoholic KOH? (2020)

Solution:

Excess alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-chloropropane.

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Q5. What type of reaction occurs when 1-chlorobutane is treated with aqueous KOH? (2023)

Solution:

When 1-chlorobutane is treated with aqueous KOH, a nucleophilic substitution reaction occurs, resulting in the formation of butanol.

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Q6. Which of the following compounds is least soluble in water? (2022)

Solution:

Bromobenzene is least soluble in water due to its non-polar nature and the presence of the aromatic ring.

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Q7. Which haloalkane is most likely to undergo elimination reactions? (2023)

Solution:

3-bromobutane is more likely to undergo elimination reactions due to the presence of a tertiary carbon.

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Q8. Which of the following compounds is least reactive in nucleophilic substitution reactions? (2023)

Solution:

Benzyl bromide is less reactive in nucleophilic substitution due to the resonance stabilization of the benzyl cation formed during the reaction.

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Q9. What is the main product when 1-chloropropane is treated with alcoholic KOH? (2019)

Solution:

Alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-chloropropane.

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Q10. Which of the following haloalkanes can undergo elimination reaction to form an alkene? (2021)

Solution:

2-bromobutane can undergo elimination to form an alkene due to the presence of a beta-hydrogen.