For which reaction mechanisms—SN1, SN2, E1, or E2—are each of the following statements true? A statement may be true for one or more mechanisms.a. The mechanism involves carbocation intermediates.b. The mechanism has two steps.c. The reaction rate increases with better leaving groups.d. The reaction rate increases when the solvent is changed from CH3OH to (CH3)2SO.e. The reaction rate depends on the concentration of the alkyl halide only.f. The mechanism is concerted.g. The reaction of CH3CH2Br with NaOH occurs by this mechanism.h. Racemization at a stereogenic center occurs.i. Tertiary (3°) alkyl halides react faster than 2° or 1° alkyl halides.j. The reaction follows a second-order rate equation.

For which reaction mechanisms—SN1, SN2, E1, or E2—are each of the following statements true? A statement may be true for one or more mechanisms.a. The mechanism involves carbocation intermediates.b. The mechanism has two steps.c. The reaction rate increases with better leaving groups.d. The reaction rate increases when the solvent is changed from CH3OH to (CH3)2SO.e. The reaction rate depends on the concentration of the alkyl halide only.f. The mechanism is concerted.g. The reaction of CH3CH2Br with NaOH occurs by this mechanism.h. Racemization at a stereogenic center occurs.i. Tertiary (3°) alkyl halides react faster than 2° or 1° alkyl halides.j. The reaction follows a second-order rate equation.

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter14: Elimination

Section: Chapter Questions

Problem 18CTQ

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The SN1 reaction is a two-step reaction, and the first step of this reaction is the formation of a carbocation intermediate. Draw the carbocation intermediates that form from the alkyl chlorides in tubes 8 and 15. 2. Again, use tubes 8 and 15 to answer the following question. In general, the more stable carbocation forms faster. Given this, which carbocation is more stable, or do they have the same stability?
For which reaction mechanisms—SN1, SN2, E1, or E2—are each of the following statements true? A statement may be true for one or more mechanisms. a.The mechanism involves carbocation intermediates. b.The mechanism has two steps. c.The reaction rate increases with better leaving groups. d.The reaction rate increases when the solvent is changed from CH3OH to (CH3)2SO. e.The reaction rate depends on the concentration of only the alkyl halide. f.The mechanism is concerted. g.The reaction of CH3CH2Br with NaOH occurs by this mechanism. h.Racemization at a stereogenic center occurs. i.Tertiary (3°) alkyl halides react faster than 2° or 1° alkyl halides. j.The reaction follows a second-order rate equation.
A carbocation intermediate is central to which of these reaction types? E1, E2, SN1, SN2 ? Choose 1
Why is the mechanism shown in Figure 28 not plausible? * A- The reagent does not have a good leaving group. B- Water is too weak a base for the reaction to occur. C- The structure of the haloalkane prevents the nucleophile from coming close to the alpha carbon atom. D- None of these statements are correct. E- All these statements are correct.
The use of curved arrows is a powerful tool that illustrates even complex reactions. a.Add curved arrows to show how carbocation A is converted to carbocation B. Label each new σ bond formed. Similar reactions have been used in elegant syntheses of steroids. b.Draw the product by following the curved arrows. This reaction is an example of a [3,3] sigmatropic rearrangement, as we will learn in Chapter 25.
True or false 1.an intermediate is produced in the SN2 reactiom is a carboncation. 2.In SN1 reactions nucleophile HI will react faster than HCL 3.Halogenated waste can be disposed off in a general waste solvent.
Match the conditions most favorable for the substitution reaction type (SN1 or SN2) Strong nucleophile Tertiary carbocation intermediate Protic solvent Primary carbocation intermediate
Fill in the reagents below/above the arrow in the ff reaction
1. which one is the starting material 2. what is the product/reaction 3. is it sn1 or sn2? (what is the reaction rate equation and mechanism?)
How does changing the alkyl halide from CH3CH2Br to (CH3)2CHBr affect the rate of an E2 reaction?
How does changing the leaving group from Cl− to Br− affect the rate of an E1 reaction?
Why we need step 3 before step 4? a. Because the nitro group increases the electrophilicity at the ortho positions which is where the bromine is added. b. Because the amine group is a strong ortho, para director which is what controls the regiochemical outcome of this bromination. c. Step 4 is unessesary. The symmetry of compound 3 allows for the bromination to be regioselective and give compound 5. 5. There will be a mixture of products because there is no selectivity for a major product.