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- 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.8) Which compound is aromatic EX b) راه FORIn an electrophilic aromatic substitution, which group is more activating: -COH or -CH2-CH3? Explain the reason.
- PQ-2. This reaction is classified as (A) a nucleophilic addition. (C) a nucleophilic substitution. NaCN H3C CH3 H₂O (B) an electrophilic addition. (D) an electrophilic substitution. HO H3C CN CH3人,。 1. CH,OH Br Br2 HBr ÓCH, 2. CH2 LiT a = Proton transfer d = Radical chain addition g = E2 Elimination b = Lewis acid/base e = Electrophilic addition SN1 Nucleophilic substitution h = C = Radical chain substitution f = E1 Elimination i = SN2 Nucleophilic substitution Identify the mechanism by which each of the reactions above proceeds from among the mechanisms listed. Use the letters a - i for your answers. 1. 2. Submit Answer Retry Entire Group 9 more group attempts remainingIdentify the type of reaction mechanism. CH3CH2CHO + HCN→→ CH3CH2CH(OH)CN Nucleophilic Substitution Reaction Elimination Reaction Nucleophilic Addition Reaction
- All electrophilic aromatic substitution reactions occur via a two-step mechanism: addition of the electrophile to form a resonance-stabilized carbocation, followed by deprotonation by a base. In the step shown below, loss of a proton to form the substitution product was drawn using the resonance structure with the + 1 formal charge at the ortho position to the carbon bonded to the electrophile. Redraw the step shown with the other two resonance structures and use curved arrows to show how these other two resonance structures can be converted to the substitution product by removal of a proton with the base shown. Part: 0/2 Part 1 of 2 H :CI-AICI, Draw the mechanism that generates the final substitution product with the +1 formal charge at the para position. Cl HC1 AICI351What reaction category/mechanism type does the following reaction fit? O addition substitution (SN1) substitution (SN2) O elimination (E1) O elimination (E2) HCI CI + HO
- Which of the following is not true about the mechanism for electrophilic aromatic substitution? O The carbocation intermediate has an sp3 carbon in the ring. O Benzene acts as a nucleophile. O The addition product is often a minor product. O Formation of a carbocation intermediate is the rate-determining step. O Aromaticity is regained by loss of H*.What is/are the products from the given radical substitution reaction? Note: show the mechanism of the reaction. NBS =CH₂ 7 hyWhich represents an efficient synthetic route to go from an alkane to an alkene? O elimination with NaNH2, followed by a water workup O anti-Markovnikov hydrohalogenation, followed by elimination O radical bromination, followed by elimination O hydration, followed by elimination O hydration, followed by ozonolysis of the double bond