Textbook Question
a. When HBr adds to a conjugated diene, what is the rate-determining step?
b. When HBr adds to a conjugated diene, what is the product-determining step?
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- 1. A Review of General Chemistry5h 6m
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- 34. Nucleic Acids1h 32m
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16. Conjugated Systems
Conjugated Hydrohalogenation (1,2 vs 1,4 addition)
Multiple Choice
Predict the major, organic product for the following reaction.
A
B
C
D
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Verified step by step guidance1
Identify the starting material as a diene with two double bonds and the reagent as HCl, which suggests an electrophilic addition reaction.
Recognize that the reaction conditions (100 °C) favor a thermodynamic control, which often leads to the most stable product.
Consider the mechanism: the proton from HCl will add to one of the double bonds, forming a carbocation intermediate.
Evaluate the stability of possible carbocations: a more substituted carbocation is more stable due to hyperconjugation and inductive effects.
Determine the major product by considering the most stable carbocation intermediate, which will lead to the most stable alkene after the addition of the chloride ion.
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