The rate of reaction of [0.1 M] sodium cyanide with [0.1 M] 1-bromo-heptane is 1.2 x 10-3 M/s. What would be the rate IF the concentration of sodium cyanide is increased to [0.233 M] and the concentration of the alkyl bromide is decreased to [0.05 3M]?
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- In the second paragraph you should explain why 2-chloro-2-methylpropane reacts with water via the SN1 mechanism instead of the SN2 mechanism, and then write the steps in the mechanism for this reaction. Then write the balanced equation for the reaction between 2-methyl-2-chloropropane and water. One of the products of this reaction is HCl. The rate at which HCl is produced is equal to the rate at which 2-chloro-2-methylpropane is consumed. In this experiment, the HCI will be neutralized by incremental addition of a sodium hydroxide solution. Write the balanced equation for the reaction between NaOH and HCI.Determine the type of mechanism for the following reaction and the rate law. Use R-Br to represent the alkyl halide in the rate equation.7. The reaction of methoxide anion with bromoethane to yield the ether ethyl methyl ether and the bromide anon (Br-) is an excellent example of a general reaction type called Sy2 (substitution nucleophilic bimolecular): CH,0+ CH,СH-Br a CH3-0-CH,СH; + Br- a. Change in enthalpy is -103 kJ/mol; the change in entropy is + 0.025 kJ/mol-K. Calculate DG at 300K. b. Is the reaction endergonic or exergonic? c. Is the reaction endothermic or exothermic? d. Use curved arrows to show the complete mechanism. Reaction of 2-methyl-1-butene with H-Cl could yield TWO alkyl chloride products. Draw and name 8. them.
- How many steps are in a reaction using an organometallic reagent? O 4 0 3 O 2 O 1What reaction category/mechanism type does the following reaction fit? O addition substitution (SN1) substitution (SN2) O elimination (E1) O elimination (E2) HCI CI + HOOnly one of the chlorine atoms in the molecule, 3,4-dichloronitrobenzene, will undergo nucleophilic substitution. Indicate which position will react and provide the expected product for the given reaction using reaction intermediates (resonance structures).
- An electron-deficient carbon atom reacts with a nucleophile, symbolized as: Nu−. Define this ?2) Organocuprates are important nucleophile in organic chemistry. They are usually generated from Grignard reagents (equation below). Draw a picture of the transition state for this reaction and why is the product formation favorable. CuR MgBrl Cul + +In nucleophilic aromatic substitution reactions that proceed by the nucleophilic addition-elimination mechanism, the reaction rate increases as the electronegativity of the halogen leaving group increases: Ar-I < Ar-Br < Ar-CI < Ar-F. Which step does this suggest is the rate-determining step of the mechanism-the addition step or the elimination step? Explain.
- 5-The hydrolysis of a series of ethyl benzoates by hydroxide ion in 85% aqueous ethanol has been investigated. A Hammett plot of the second order rate constants (K) gave a reaction constant p = 2.56. Calculate how much faster ethyl 4- nitrobenzoate will undergo base catalyzed hydrolysis compared to ethyl benzoate under similar conditions. O,N+ CH3OH methanol Suppose you were told that the above reaction was a substitution reaction but you were not told the mechanism. Evaluate the following categories to determine the reaction mechanism and then draw the structure of the major organic product. Type of alkyl halide: Type of nucleophile: Solvent: Is the product racemic? ***** • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • If the reaction produces a racemic mixture, just draw one stereoisomer. Sn [1 ? ChemDoodleⓇ 1H3C CH3 H3C NA C→XT Br Br₂ CH₂Cl₂ H3C Electrophilic addition of bromine, Br₂, to alkenes yields a 1,2-dibromoalkane. The reaction proceeds through a cyclic intermediate known as a bromonium ion. The reaction occurs in an anhydrous solvent such as CH₂Cl₂. CH3 Br In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion to yield the product. Due to steric clashes, the bromide ion always attacks the carbon from the opposite face of the bromonium ion so that a product with anti stereochemistry is formed. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions Br CH3 H3C CH3