Which mechanism(s) feature(s) a single transition state with no Intermediate? O E2 O E2 and SN2 SN1 O SN1 and SN2 O SN2

Please complete parts A and B

Draw a mechanism for the following intramolecular Mizoroki-Heck reaction. The Pd catalyst can be abbreviated as [Pd]. Br Me Pd(PPH3)4 (5 mol%) Et3N DMF, 90°C Me

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Which is the correct depiction of the transition state for the reaction shown below? a с A b B Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. с H3CO H3CO. d D CH3 e C&D CH3 possible transition states CH3 CH3 CH3 CH3 H3CO H3CO H3CO H3CO yox yox sxx sx H3CO H3CO H3CO CH3 CH3 CH3 CH3 C D A B A H3CO H3CO, CH3 CH3

Choose one.

The two-step mechanism for the formation of products is shown below: Y M + E (slow) X + M H + F (fast) What is the intermediate in the reaction? O M O Y OF

Answer the following questions associated with the mechanism below:Step 1: 2NO2  NO3 + NO (slow)Step 2: NO3 + CO  NO2 + CO2 (fast)a. What is the overall reaction associated with this mechanism?b. Identify any/all intermediates in the proposed mechanism:c. What is the molecularity of the 1st step of the rxn? d. What is the molecularity of the 2nd step of the rxn? e. Which step of the rxn is the rate limiting (determining) step? f. Write an expression for the rate law associated with this mechanism in the space provided

Which of the following represents the transition state of the rate- determining step in the substitution reaction between tert-butyl bromide and methanol? H3C CH, H,C CH, Br sOc--------Br 1 H3C 2 H3C CH: CH3 H3C CH, Br -Br а. 1 b. 2 с. 3 d. 4 a O b

1. Which one of the following four schemes (A-D) represents a step in the mechanism of the reaction in the box? Cl2, light (hv) + HCI CỈ H Cl-H A B H C D H B OD OC O A