Haloalkanes

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Q1. Which of the following compounds is a primary haloalkane?

Solution:

CH3CH2CH2Cl is a primary haloalkane as the carbon attached to the halogen is bonded to only one other carbon.

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Q2. What type of reaction occurs when haloalkanes react with metals like magnesium?

Solution:

The reaction of haloalkanes with metals like magnesium leads to Grignard formation, which is a key step in organic synthesis.

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Q3. What type of reaction occurs when haloalkanes react with aqueous KOH?

Solution:

Haloalkanes react with aqueous KOH primarily through nucleophilic substitution to form alcohols.

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Q4. What is the expected product when 1-chlorobutane reacts with aqueous NaOH?

Solution:

The expected product is Butanol due to nucleophilic substitution with hydroxide ion.

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Q5. Which of the following haloalkanes is expected to be the most reactive in nucleophilic substitution reactions? (2023)

Solution:

Iodoethane is the most reactive due to the weaker C-I bond compared to C-Br, C-Cl, and C-F bonds.

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Q6. What type of mechanism is involved in the reaction of tertiary haloalkanes with nucleophiles? (2020)

Solution:

Tertiary haloalkanes typically undergo the SN1 mechanism, which involves the formation of a carbocation intermediate.

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Q7. What type of reaction occurs when haloalkanes react with metals like zinc?

Solution:

The reaction of haloalkanes with metals like zinc is a reduction reaction, forming alkanes.

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Q8. What is the expected major product when 2-bromobutane undergoes elimination reaction?

Solution:

The major product of the elimination reaction of 2-bromobutane is But-2-ene due to the formation of the more stable alkene.

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Q9. What is the product of the reaction between 1-bromobutane and sodium hydroxide in ethanol? (2021)

Solution:

The reaction of 1-bromobutane with sodium hydroxide in ethanol leads to the formation of butanol through nucleophilic substitution.

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Q10. What is the product of the reaction between 1-bromopropane and sodium hydroxide in ethanol?

Solution:

1-bromopropane reacts with sodium hydroxide in ethanol to form 1-Propanol via nucleophilic substitution.