Haloalkanes

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Q1. 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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Q2. What type of reaction occurs when haloalkanes react with nucleophiles? (2020)

Solution:

Haloalkanes typically undergo nucleophilic substitution reactions where the halogen is replaced by a nucleophile.

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Q3. 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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Q4. What is the expected product of the reaction of 1-chlorobutane with zinc in dry ether?

Solution:

The reaction of 1-chlorobutane with zinc in dry ether leads to the formation of Butane via Wurtz reaction.

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Q5. 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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Q6. What is the IUPAC name of CH3CH2Cl?

Solution:

The IUPAC name of CH3CH2Cl is Chloroethane, as it is a two-carbon alkane with a chlorine substituent.

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Q7. What is the main type of reaction that haloalkanes undergo? (2020)

Solution:

Haloalkanes primarily undergo nucleophilic substitution reactions due to the presence of a good leaving group (halogen).

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Q8. 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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Q9. What is the major product when 2-bromobutane is treated with KOH in ethanol?

Solution:

The major product is But-2-ene due to the more stable double bond formed during elimination.

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Q10. Which reagent can be used to convert an alkyl halide to an alcohol?

Solution:

NaOH can be used to convert an alkyl halide to an alcohol through nucleophilic substitution.