Alkyl halides react with dialkyl copper reagents to give:

Options

A. Alkenes
B. Alkyl copper halides
C. Alkanes
D. Alkenyl halides

Answer

To solve the question regarding the reaction of alkyl halides with dialkyl copper reagents, we can break it down into a step-by-step explanation.

### Step 1: Understanding the Reactants
- **Alkyl Halides**: These are organic compounds containing carbon and halogen atoms (from group 17 of the periodic table: fluorine, chlorine, bromine, or iodine). They can be represented as R-X, where R is an alkyl group and X is a halogen.
- **Dialkyl Copper Reagents**: These are organocopper compounds represented as R2CuLi, where R is an alkyl group. A common example is lithium diethylcuprate (C2H5)2CuLi, also known as Gilman reagent.

### Step 2: The Reaction Mechanism
- When an alkyl halide (R'-X) reacts with a dialkyl copper reagent (R2CuLi), a nucleophilic substitution reaction occurs.
- The copper reagent acts as a nucleophile, where one of the alkyl groups (R) from the dialkyl copper reagent attacks the carbon atom of the alkyl halide (R'-X), leading to the formation of a new carbon-carbon bond.

### Step 3: Formation of Products
- The reaction results in the formation of a new alkane (R-R') and a by-product of copper halide (R-Cu) and lithium halide (LiX).
- The general reaction can be summarized as:
\[ R2CuLi + R'-X \rightarrow R-R' + R-Cu + LiX \]
- Here, R-R' is the newly formed alkane, and R-Cu and LiX are the side products.

### Step 4: Example of the Reaction
- For instance, if we take ethyl iodide (C2H5I) as the alkyl halide and lithium diethylcuprate ((C2H5)2CuLi) as the dialkyl copper reagent, the reaction can be illustrated as follows:
\[ (C2H5)2CuLi + C2H5I \rightarrow C4H10 + (C2H5)Cu + LiI \]
- In this case, butane (C4H10) is formed as the main product.

### Conclusion
- The overall conclusion is that when alkyl halides react with dialkyl copper reagents, they yield alkanes as the primary product.

### Final Answer
- **Alkyl halides react with dialkyl copper reagents to give: Alkanes.**

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