The initial rates for the following elimination reaction were measured under different concentrations of the substrate andbase; the data are tabulated at the right. Do the data suggest an E1 reaction or an E2 reaction?Trial Number[R-Br][KOCH,CH3]Rate (M/s)Br11.0 M1.0 M2.35 × 10-6KOCH,CH320.50 M0.50 M5.9 × 10-7+CH;CH2OH30.50 M1.0 M1.20 × 10-6

Given reaction - Given data - Trial Number [R-Br] [KOCH2CH3] Rate (M/s) 1 1.0 M 1.0 M 2.35 x…

Answered: The initial rates for the following…

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter14: Elimination

Section: Chapter Questions

Problem 5E

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The initial rates for the following elimination reaction were measured under different concentrations of the substrate and base (water); the data are tabulated at the right. Do the data suggest an E1 reaction or an E2 reaction? Trial Number [R-OCH3] [H,O] Rate (M/s) 1 0.010 M 0.45 M 9.50 × 10-4 H,O 0.020 M 0.45 M 1.85 × 10-3 OCH3 CH3CN, H 3 0.020 M О.22 М 1.85 × 10-3
In an E2 mediated elimination reaction of an alkyl halide (H-X) using NaOCH3 as base, which of the following statement is not true? O The reactivity order for alkyl halides (RX) is tertiary secondary> primary. O The rate of reaction = k2 (alkyl halide] [NaOCH₂] O The reaction occurs in a single step. O The rate is independent of the leaving group.
The initial rates for the following two elimination reactions were measured under different concentrations of the electrophiles and bases (H2O in the top reaction, KOCH½CH3 in the bottom reaction; all data is presented in the two tables. For each reaction, top and bottom, does the data suggest an El or E2 reaction pathway (rates are all 10* units)? Explain. Write the rate equations for each reaction. Trial Number [R-OCH3] [H,0] Rate (M/s) 1 0.010 M 0.45 M 9.50 x 10-1 H20 2 0.020 M 0.45 M 1.85 x 10 3 CH,CN, осн, 3 0.020 M 0.22 M 1.85 x 10-3 Trial Number [R-Br) [KOCH,CH3] Rate (M/s) 1.0 M 1.0 M 2.35 x 10 6 Br 0.50 M 0.50 M 5.9 x 10 + KOCH;CH, CH,CH,OH 3 0.50 M 1.0 M 1.20 x 10-6 Top Reaction: Bottom Reaction:
9. The initial rates for the following two elimination reactions were measured under different concentrations of the electrophiles and bases (H2O in the top reaction, KOCH2CH3 in the bottom reaction; all data is presented in the two tables. For each reaction, top and bottom, does the data suggest an El or E2 reaction pathway (rates are all 10* units)? Explain. Write the rate equations for each reaction. Trial Number [R-OCH.] [H,0] Rate (M/s) 0.010 M 0.45 M 9.50 X 10-4 HO 2 0.020 M 0.45 M 1.85 x 10 3 CH,CN, H OCH, 0.22 M 1.85 x 10- 3 0.020 M Trial Number R-Br] [KOCH,CHal Rate (M/s) 6 1.0 M 1.0 M 2.35 X 10 Br 0.50 M 0.50 M 5.9 x 10* + KOCH,CH, CH,CH,OH 3 0.50 M 1.0 M 1.20 x 10 Top Reaction: Bottom Reaction:
Below is the equation for a nucleophilic substitution reaction and some experimental data. CH3CH2Br + CH3COO- ⇌ CH3CH2CO2CH3 + Br- Rate = k [CH3CH2Br][CH3COO-] Which mechanism would best fit the data?
One of the steps in the mechanism of the above reaction as shown below. Draw the structure of all the products of this reaction. com/mm/takeAssignCourt Rotivity.do?locator assignment-take 1 pt ment Eto O Eto O 3. NaOH, H₂O, heat 4. HCI, H₂O, heat One of the steps in the mechanism of the above reaction is shown below. Draw the structure of all of the products of this reaction. O OEt O 1. Eto Na 2 Å OH You do not have to consider stereochemistry. • Draw enolate anions in their carbanion form. . You should include all products. Ôno P Ć [References) . Include counter-ions, e.g., Na, I, in your submission, but draw them in their own separate sketcher. . Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. . Separate multiple products using the + sign from the drop-down menu. ///-000- IF Previous Email Instructor
2. Determine which mechanism, if any, will dominate in the reactions below. Choose between SN2, SN1, E1 and E2 or no reaction (NR). Provide the major product. NaOH H₂O Reaction Type NaSCH, DMF Reaction Type OTS NaOtBu HotBu, Heat H₁C CH₂ Nal DMSO Reaction Type Reaction Type H₁C NH₂ ether Reaction Type
a) Draw the reaction mechanism for the reaction. b) Determine the limiting reagent.
Give one example of elimination reaction (E2) type. Show the reactants materials and the product. Draw the reaction mechanism?
In an E1 mediated elimination reaction, which of the following statement is not true? The reactivity order for alkyl halides (RX) is tertiary> secondary> primary. The rate of reaction = k₁ [alkyl halide] [NaOCH3)- O The rate is dependent on the leaving group. The reaction proceeds through a carbocation intermediate.
The starting compound was treated with different nucleophiles shown in the table. The reaction was carried out in ethanol (similar to CH3OH) at 25°C. This time the leaving group isn’t a single (halogen) atom; it's a group of atoms that leaves as a unit. (CH3);COC,H4NO2 + NaNu or HNu (CH3);CNu + brightly colored compound The byproduct has an intense yellow color, while the starting materials are colorless, so the appearance of a yellow color indicates the reaction is occurring. Reaction Nucleophile (Nu) Compound Relative reactivity Number Color change observed NaOCH3 Yellow after 0.52 sec 1 Very bright yellow immediately НОСНЗ 2 NaSCH3 Yellow after 0.52 sec 3 Faint bright yellow immediately HSCH3 4 1. Rank the relative reactivity of nucleophiles. The shortest time means fastest reaction, which gets number 1 reactivity. The longest time means slowest reaction, which gets the highest number. There may be some tied scores. 2. The name of the mechanism that best explains all four reactions…
How many acid-base steps occur in this mechanism? :OH fö OH ₂ H CI: -H₂O (C5H12O) (CsH3O*) :CI: :CI:- yox (C5H1*) (C5H₁1CI)

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