Question

How do I answer questions in number 6 please, Thanks

6) (12 points) Draw mechanisms for the following transformations +HC HO Br2 + HBr H3C H3 hv H3C rパ HO Br H2O + HBr c) (Hint for Se: Doubling the concentration of water has no effect on the rate.) 7.) (4 points) For the reaction in question 6b,t below is seen product, and what product ratio of question 6b is in fact the major prod stabilities of intermediates involved in the mechanism of free-radical halogenation. as a minor product. (a) Explain why you might have expected the molecule below to be the majo you predict based only on statistical considerations. (b) Explain why the produ uct, bringing into your argument relative bond strengths and the CH3 Br 8.) (6 points) For the reaction in question 6c, it is experimentally observed that doubling the concentration of water has no effect on the reaction rate. (a) Write the rate equation for the reaction. (b) Redraw the product indicating the proper stereochemistry. (c) Explain the stereochemistry you indicated in part b by referring to th mechanism you drew 9.) (8 points) Make the following molecules, starting from a terminal alkyne and any alkyl halide, if needed. (Hint: some of the reactions you need are contained in problem #5) a) b)

Answer 1

a) This is an alkenes halogenation reaction. It is an SN2 reaction followed by a nucleophilic attack of water to the complex formed in the SN2 reaction.

b)This is a halogenation reaction of alkanes via free radicals, free radicals are formed by irradiation with light (hv). Radical formation causes the reaccommodation of atoms in the alkane.

c) Because the water concentration does not alter the reaction, it is an SN1 nucleophilic substitution reaction (only dependent on alkyl halide). In this reaction, a carbocation is first formed and then attacked by water (nucleophile) to form an alcohol.

ai 14 o rt t HC 니 H C 3 CH + Asr 943 C4, 43 AB