Organic Chemistry - Haloalkanes & Haloarenes

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Q1. 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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Q2. 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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Q3. 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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Q4. 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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Q5. Which of the following is the correct order of reactivity of haloalkanes in nucleophilic substitution reactions? (2023)

Solution:

The reactivity of haloalkanes in nucleophilic substitution reactions decreases in the order R-I > R-Br > R-Cl > R-F due to bond strength.

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Q6. Which of the following compounds is an aryl halide? (2019)

Solution:

Bromobenzene is an aryl halide as it contains a halogen atom bonded to an aromatic ring.

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Q7. Which of the following haloalkanes can undergo elimination reaction more readily? (2023)

Solution:

Tertiary haloalkanes like 3-bromopropane can undergo elimination reactions more readily due to the stability of the resulting alkene.

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Q8. 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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Q9. What type of reaction occurs when 1-chloropropane reacts with sodium cyanide? (2023)

Solution:

The reaction between 1-chloropropane and sodium cyanide is a nucleophilic substitution reaction where the cyanide ion replaces the chlorine atom.

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Q10. 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.