What alkyl halide will be obtained in greatest yield? Ignore stereoisomers.
d.

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Step 1: Analyze the reaction conditions. The presence of peroxide indicates that the reaction will follow the anti-Markovnikov addition mechanism. This means the bromine atom will add to the less substituted carbon of the double bond.

Step 2: Identify the structure of the starting alkene. The molecule contains two double bonds, one in the terminal position and one internal. Since HBr is in excess, both double bonds will react sequentially.

Step 3: For the first addition of HBr, the bromine will add to the less substituted carbon of the terminal double bond, following the anti-Markovnikov rule. This forms a primary alkyl bromide intermediate.

Step 4: For the second addition of HBr, the bromine will add to the less substituted carbon of the internal double bond, again following the anti-Markovnikov rule. This forms the final product.

Step 5: The final product will be the alkyl halide where bromine atoms are added to the less substituted carbons of both double bonds. Ignore stereoisomers as specified in the problem.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Anti-Markovnikov Addition

Anti-Markovnikov addition refers to the regioselectivity observed in the addition of HX (like HBr) to alkenes in the presence of peroxides. In this reaction, the hydrogen atom from HBr adds to the less substituted carbon of the alkene, resulting in the formation of the less stable, but more substituted alkyl halide. This contrasts with Markovnikov's rule, where the hydrogen would add to the more substituted carbon.

Alkyl Halides

Alkyl halides are organic compounds derived from alkanes that contain one or more halogen atoms (F, Cl, Br, I) replacing hydrogen atoms. They are classified based on the carbon atom to which the halogen is attached, such as primary, secondary, or tertiary alkyl halides. The structure and substitution pattern of alkyl halides significantly influence their reactivity and the types of reactions they undergo.

Reaction Mechanism

Understanding the reaction mechanism is crucial for predicting the products of chemical reactions. In the case of the anti-Markovnikov addition of HBr with peroxides, the mechanism involves the formation of free radicals, which leads to the addition of HBr across the double bond. This mechanism is distinct from ionic mechanisms and highlights the role of radical intermediates in determining the final product distribution.

What alkyl halide will be obtained in greatest yield? Ignore stereoisomers. d.