Question

Complete these reactions. (a) CC(C)(C)C=CBr (b) C=C1CCCCC1

Short answer

Answer: For the first molecule (allylic bromide), a possible reaction is elimination under basic conditions, resulting in a more substituted alkene. For the second molecule (alkene connected to a cyclohexane ring), possible reactions include hydrogenation, hydrohalogenation, and epoxidation, but more information about reaction conditions is needed to predict the exact product.

Step-by-step solution

Reaction (a)

Recognize the functional group in the molecule CC(C)(C)C=CBr. In this case, the functional group is an allylic bromide. A common reaction of allylic halides is the allylic substitution or elimination. Since we are not given any other reactants, we can assume the reaction is under basic conditions, so an elimination is more favorable. The possible product would be the elimination of the bromine, forming a more substituted alkene: CC(C)(C)C=C=C

Reaction (b)

Recognize the functional group in the molecule C=C1CCCCC1. In this case, the functional group is an alkene directly connected to a cyclohexane ring. Alkenes can generally undergo reactions like electrophilic additions, epoxidation, or hydrogenation. Since we are not given any other reactants, it is not possible to predict the exact product without more information about the reaction conditions. However, we can list some possible reactions based on common alkene transformations: 1. Hydrogenation: Addition of H2 with a catalyst to give a fully saturated cyclohexane ring 2. Hydrohalogenation: Addition of a hydrogen halide (HX) to give a halogen-substituted cyclohexane ring (X can be Cl, Br or I) 3. Epoxidation: Formation of an epoxide ring on the double bond These are some of the possible reactions, but without more information, it is not possible to predict the exact product.