4. On the basis of your mechanism for Problem 3(c), answer the following questions: (a) Additions of Br₂ and ArSCI to [2.2.1]-bicycloheptene give the products shown in Equa- tions 11 and 12, respectively. Give a mechanism for the products of Reaction 11 and explain why only the bromination gives rearrangement products. Br Br Br +Br₂- D.A. dr. A D--- + ArSCI→ Br SAr (11) (12) -CH=CH₂ reacts 1000 times faster than Ph-CH-CH₂ with Brg-HOAC but only 3.8 times faster with pC1-CH₂SCI in HOAc at 25°C. Explain. (c) Which would you expect to show a better linear correlation with the rate constants for bromination of a number of alkenes-the rate constants for hydration or those for addition of ArSCI to the same alkenes?