Retative rates of hydrogenation of alkenes using Wilkinson's catalyst at 25 °C are given below. Explain the observed rates: Rate constant x100 Compound hydrogenated (Lmol-ls- 31-6 H. 6-6 H3C CH3 H3C 1-8 CH3 CH3 0-6 H3C CH3 <0-1 C2H5

The acid-catalysed conversion of γ-hydroxybutyric acid (GHBA) into its lactone, γ-butyrolactone (GBL) is a reversible reaction. The GHBA to GBL forward reaction is first-order with respect to the GHBA concentration; the GBL to GHBA reverse reaction is first-order with respect to the GBL concentration. An experimental study of the kinetics of this reaction was undertaken in 0.2 mol L​​​​​​​-1hydrochloric acid (HCl) at 298 K. The initial concentration of GHBA was 18.23 × 10-3mol L-1 . The concentration of GBL in solution was followed as a function of time (t), as indicated in Table B.3: Time/min 0 21 36 50 65 80 100 ∞ GBL Concentration / 10-3 L-1 0 2.41 3.73 4.96 6.10 7.08 8.11 13.28 Use the data in Table B.3 to determine the equilibrium constant and the first-order rate constants for both forward and reverse reactions.

Parts A - D.

Given the transition state diagram(s) below, identify the mechanism(s) of catalysis. Mg2+ Mg2+ H OH H-C-H HOH H H - (M₂C)N= H H-C-H HO -H H- HO -H OH-O -O-H- H-N(CH₂) CH₂OH H H₂C H H LN (CH2) H OH HOH:N (0³H)² CH₂OH H₂C t

For the gas phase isomerization of cis-cyanostyrene, cis-C6H5CH=CHCN_trans-C%HşCH=CHCN the rate constant at 677 K is 5.01x10-4 51 and the rate constant at 717 K is 3.39x10-35-1. What is the activation energy for this reaction? kJ/mol

The conversion of oxygen gas to ozone can be catalyzed by the pollutant, nitrogen monoxide gas in the air. Suggest a possible mechanism for this reaction if nitrogen dioxide gas and oxygen free radicals are known to be formed as the intermediate compounds. What is the type of catalysis involved?

5c) Write the rate equation for the following SN1 reaction:

The following initial rate data are for the reaction of tertiary butyl bromide with hydroxide ion at 55 °C: (CH3)3CB + OH → (CH3)3COH + Br Experiment [(CH3)3CB1],, M [OH], M Initial Rate, Ms-1 1 0.890 1.50x10-3 1.50x10-3 3.01x10-3 3.01x10-3 0.118 0.118 2 1.78 0.890 1.78 3 0.237 4 0.237 Complete the rate law for this reaction in the box below. Use the form k[A]j™[B]" , where '1' is understood for m or n and concentrations taken to the zero power do not appear. Don't enter 1 for m or n Rate = From these data, the rate constant is

Answer carefully and correctly

(19) Consider the following reaction. From the given choices of intermediates and/or final products, choose the 5 related to this reaction and put them in order to describe the complete mechanism (all the steps involved) for this reaction.