CH3 CH3 NE13 (1 equiv), CH2C12 O=S=O

(Q93) Which of the following best describes how a catalyst speeds up the rate of a reaction? O By decreasing the activation energy required to form the transition state O By decreasing the enthalpy difference between products and reactants O By removing the transition state Through acting as a supplemental reaction substrate O By ensuring that the reactant molecules do not collide

C. HINT: Hydrogenation Br + O ? O -

(3) Evaluate the following uses of catalysis in terms of the goals of green chemistry (it is up to you if you want to refer to the 12 Principles or just the more general goals proposed by Dr. Lipke). Identify benefits as well as possible downsides. 2 a. A catalytic process that uses O, to oxidize an organic substrate dissolved in hexanes as a solvent, replacing a previous process that required the use of pyridine-N-oxide as an oxidant. b. A catalytic process that allows organic plant matter to be broken down into small organic molecules that can be used to produce fuels and fine chemicals that would otherwise be made from petroleum. c. A catalytic process that uses a mercury salt to catalyze the oxidation of methane to a methanol derivative, circumventing 2 a more traditional route using H, and CO to produce methanol as an intermediate.

Identify the products of the 1,2-addition for the following reaction. OI O II O III O IV O III and IV Br Br + En Br Br + En || Br₂ CC14 ? Br Br + En ||| Br + En IV

Indicate the scheme and detailed reaction mechanism of the reactions:

What is the function of the enzyme lactase?

Show the mechanism for the following

Can you show the reaction mechanism step-by-step for  C₃H₈O (l)  → C3H6 (g) + H2O (l) propan-1-ol    →    propene + water Please show the electron movement and the way in which the bonds break. Can you please also show how many bonds there are and what type they are (eg. Sigma, Pi)? Thanks.