Which of the following alkynes will give exclusively 2,2-dibromo-4-methyl pentane upon reacting with excess of HBr? ΟΙ O II O III OIV || = III IV
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- MUIT What is the major product of the reaction when 2-methyl-1,3-pentadiene reacts with HBr at positive 60°C (60°C)? O O O Br Br a Br Br xa5-57 You know the mechanism of HBr addition to alkenes, and you know the effects of various substituent groups on aromatic substitution. Use this knowledge to predict which of the following two alkenes reacts faster with HBr. Explain your answer by drawing resonance structures of the carbo- cation intermediates. CH=CH2 .CH=CH2 and CH30 O2NIn light of the fact that tertiary alkyl halides undergo spontaneous dissociation to yield a carbocation plus halide ion (see Problem 10-45), propose a mechanism for the following reaction.
- What is the expected major product(s) of HCI addition to the alkene below? I and II I and IV II and III Br 1 CI Br || Br Br III HCI 2 Br IV Br CIIdentify the expected major product of the following electrocyclic reaction. → OI Oll O III OIV OV A ? KYYAK 8 +En ||| + En I || IV + En VWhy alkene will yield the most stable carbon cation during the electrophilic addition of HCI. O A OB O O C D O E Ph CF3 D Ph
- Predict the product(s) for the following reaction. O ll + enantiomer I OI ||| OH O IV OH CN OH + enantiomer || 1. NaCN 2. H₂O CN "ОН + enantiomer ||| IV CN CNOH OH ∞∞ BF3 Et₂O This reaction takes place via a pinacol rerrangement. Please, draw curved arrows to show the movement of electrons in this SPECIFIC step of the reaction mechanism. +BF3 HO: :OH OH (BF3OH)Predict the dehydrohalogenation product(s) that result when the following alkyl halides are heated in alcoholic KOH. When more than one product can be formed, rank them in terms of their predicted stability (1 is most stable isomer, 2 the next most stable isomer, etc...) a) b) HD HD H CH3 ''CI H CH3 Br 'Br KOH EtOH KOH EtOH KOH EtOH
- Which of the following alkenes will yield a meso dihalide when reacted with Br, at room temperature? %3D II IVElimination reactions of cis- and trans-1-bromo-2-methylcyclohexanes with Eto in ETOH could potentially give the two products, 1-methylcyclohexene (1) or 3-methylcyclohexene (2). Which answer (a-d) indicates the major products for each reaction? Br „Br EtO Eto "CH3 ELOH `CH3 *CH ELOH "CH3 cis trans Select one: a. 2 from the cis and 1 from the trans substrate b. 2 both from the cis and trans substrates c. 1 both from the cis and trans substrates d. 1 from the cis and 2 from the trans substrateElimination reactions of cis-and trans-1-bromo-2-methylcyclohexanes with NaOEt in E1OH can give the same or different main product, 1-methylcyclohexene (1) or 3-methylcyclohexene (2). Which of (a)-(d) indicates the main products? Br Br NaOEt NaOEt ELOH ELOH Me `Me Me Me cis 1 2 trans A. 1 both from the cis and trans substrate B. 2 both from the cis and trans substrates C. 1 from the cis and 2 from the trans substrate D. 2 from the cis and 1 from the trans substrate