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- Elimination occurs when (Z)-3-bromohex-3-ene is treated with NaNH2. Under the same conditions, 1-bromocyclohexeneundergoes elimination much more sluggishly. Explain why1. Which among these would be the most stable carbocation?a. Allylicb. Vinylicc. Primaryd. Secondary2. What is the primary reason for the stability of tertiary carbocations?a. Free rotationb. Resonancec. HyperconjugationWhen Br2 is added to buta-1,3-diene at -15 °C, the product mixture contains 60% ofproduct A and 40% of product B. When the same reaction takes place at 60 °C, theproduct ratio is 10% A and 90% B.Show why A predominates at -15 °C and B predominates at 60 °C.
- Predict mechanistically what stereoisomers of 3-chloro-5-methylcyclohexene should form when (image below) is treated with Lucas reagent (ZnCl2/H30+Cl-).Please identify priorities of functional groups and name following molecules based on thier stereochemistry as R or SWhich substituent is the strongest deactivator to EAS reactions? -NO2 -Cl -CH3 -OH
- When 2-bromo-3-phenylbutane is treated with sodium methoxide, two alkenes result (by E2 elimination). The Zaitsevproduct predominates.(a) Draw the reaction, showing the major and minor products.(b) When one pure stereoisomer of 2-bromo-3-phenylbutane reacts, one pure stereoisomer of the major product results.For example, when (2R,3R)-2-bromo-3-phenylbutane reacts, the product is the stereoisomer with the methyl groups cis.Use your models to draw a Newman projection of the transition state to show why this stereospecificity is observedWhen 2-bromo-3-phenylbutane is treated with sodium methoxide, two alkenes result (by E2 elimination). The Zaitsevproduct predominates.(a) Draw the reaction, showing the major and minor products.(b) When one pure stereoisomer of 2-bromo-3-phenylbutane reacts, one pure stereoisomer of the major product results.For example, when (2R,3R)-2-bromo-3-phenylbutane reacts, the product is the stereoisomer with the methyl groups cis.Use your models to draw a Newman projection of the transition state to show why this stereospecificity is observed.(c) Use a Newman projection of the transition state to predict the major product of elimination of (2S,3R)-2-bromo-3-phenylbutaneArrange the following carbocations in their correct order of stability. 1=Most stable and 4=least stable.
- Arrange the following group in order of increasing priority. Q) -CH3 -H -Br -CH2CH3Order the following substituents from highest priority to lowest priority: CH3, OH, H,F. Use the Cahn-Ingold-Prelog priority system. a. F, CH3, OH, H b. H, CH3, F, OH c. F, OH, CH3, H d. H, CH3, OH, FRank the following groups in order of decreasing priority. −CH=CH2, −CH3, −C≡CH, −H