Organic Chemistry - Haloalkanes & Haloarenes

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Q1. What type of reaction occurs when 1-chloropropane is treated with aqueous KOH? (2019)

Solution:

The reaction of 1-chloropropane with aqueous KOH leads to nucleophilic substitution, resulting in the formation of propanol.

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Q2. Which of the following is a common method for the preparation of haloalkanes? (2022)

Solution:

Halogenation of alkanes is a common method for preparing haloalkanes, where alkanes react with halogens in the presence of UV light.

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Q3. What type of reaction occurs when 1-bromopropane reacts with sodium cyanide? (2023)

Solution:

The reaction between 1-bromopropane and sodium cyanide is a nucleophilic substitution reaction, resulting in the formation of propanenitrile.

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Q4. What type of reaction occurs when 1-chloropropane reacts with sodium iodide in acetone? (2023)

Solution:

The reaction is a nucleophilic substitution (S_N2) where iodide ion replaces the chlorine atom.

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Q5. 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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Q6. 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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Q7. 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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Q8. What is the main product of the reaction of 1-bromo-2-methylpropane with KOH in ethanol? (2020)

Solution:

The reaction of 1-bromo-2-methylpropane with KOH in ethanol leads to the formation of 2-methylpropene through an elimination reaction.

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Q9. What type of reaction occurs when 1-chloropropane reacts with aqueous KOH? (2023)

Solution:

The reaction of 1-chloropropane with aqueous KOH leads to an elimination reaction, forming propene.

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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.