Question

Can you explain how you came upon the answer also

1. Rank the following compounds in order of increasing stability (least to most stable). As you answer this question, think of why (give reasons) one molecule is more or less stable than another. 2. Predict the MAJOR product(s) for the reaction below. Pay close attention to stereochemistry. Provide a mechanism as to how you arrive with your answer. If your compound is chiral, indicate the configuration [(R) or (S)] of the product(s). H-CI 3. Predict the MAJOR product(s) for the following reactions. Indicate stereochemistry where available. H-Br A0 oc

Answer 1

Molecule which have least number of double bonds, that have more stability and has lower in energy. As we can see, molecule A has two double bonds and other molecules have three double bonds. Therefore, the molecule A is most stable. Among the molecules B, C, and D, the molecule D is stable because it has three conjugated double bonds. Among the molecule B and C, the molecule B has more substituted double bond, therefore, the molecule B is more stable than the molecule C. Therefore, the stability order is as follows: A > D > B > C 2. In this molecule, the less substituted alkene is more reactive. Structure of the molecule is shown below as follows: Therefore, less substituted double bond reacts with HBr as follows: 3. At 0 degree C the more reactive less substituted double bond reacts with HBr and at 40 degree C both double bonds react with HBr as follows: