a.) Classify the following carbocations (1°, 2°, or 3°). b.) Encircle the carbocation/s that can rearrange to a more stable structure. CH3 CH3 CH3 CH2 CH2 CHy-+ CH3
Q: Explain the attached statement is true or not ?
A: Given:
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Q: QUESTION 1 Circle the best dienophile CH3
A: In Diels-Alder reaction dienophile is the 2pi system .
Q: Circle the stronger acid. CH2-CH2-OH CH3-CH-OH F
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Q: 1) Br2, heat 2) 2 equiv. NaCN DMF
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Q: Identify the most stable carbocation. Select one: О . ОН
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Q: 4. (2 pts) Circle the most stable carbocation and cross out the least stable carbocation among the…
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Q: Rank these alkenes according to stability:
A: Alkenes stability can be explained by "hyperconjugation" Displacement of alpha C-H sigma…
Q: Draw an energy diagram for an E2 reaction: (CH3)3CBr + −OH →(CH3)2C=CH2 + H2O + Br−
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Q: Which of the following within a tetrahedral intermediate leaves most readily as a nucleofuge? *…
A: A nucleofuge is a species that acts as a leaving group in the reaction. It is a leaving group…
Q: . a.) Classify the following carbocations (1º, 2º, or 3º). b.) Encircle the carbocation/s that can…
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Q: Which cycloaddition reaction will proceed the FASTEST? Select one: `CHO OHC. Lons CH3 CHO
A: The given reaction is a Diels Alder reaction where substituted alkene (dienophile) reacts with the…
Q: 2. Circle the molecule that would undergo the fastest E2 reaction. Provide an explanation, using…
A: For the elimination to occur via E2 the leaving group must be axial.
Q: 3. In each pair, circle the species that is more stable. OH2 OH2
A: In the first pair, the second structure is more stable. The stability of the carbonation depends on…
Q: Question 8 Rank the following carbocations from most stable to least stable: II II O III >I> II OI>…
A: Given that, Three carbocations have been given,we have to find out order of stability?
Q: H.C. CH3 CH3 CH3
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Q: . Explain why do you choose that product and mechanism or in case something else happens explain…
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Q: OCH3
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Q: Arrange carbocation in order of increasing stability
A: More the hyperconjugation, more is the stability of the carbocation.
Q: Be sure to aDSwer all parts. Label each stereogenic center as R or S.
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Q: (d) Why do you add H2O to CH2O instead of adding H+ to CH2O in order to balance CH3OH -> CH2O ?
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Q: For the following pair of carbocations (A and B), select the one that is more stable and explain…
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Q: Which properly shows resonance of an allylic system? B C H. O: D
A: Resonating structures are the different structures which are obtained by the movement of pi of…
Q: b. С. + + + a.
A: The reactive intermediate species in which carbon atom forms only three bonds and contains a…
Q: Which alkene is lower in energy? r The alkene on the left is lower in energy The alkene on the right…
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Q: Br K* OC(CH)3 K* OC(CH); Br cis trans
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Q: What type of carbocation is shown? (+)
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Q: . Provide a curved arrow mechanism for the transformation below. OCH3 Br2 enantiomer Br CH3OH
A: addition of Br2 to alkene leading to the formation of a cyclic intermediate stage. attack of…
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A: ->partially reduction of alkyne give alkene. ->Reduction of ketone produce alcohol.
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Q: Draw the following compound on your separate sheet. (1S,2S)-5-(2methylepoxy)cyclopent-2-enol
A: Given name, (1S,2S)- 5- (2 methylepoxy)cyclopent-2-enol
Q: ng carbocations
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Q: Which is the MORE STABLE carbocation? + CH2CH2 CHCH3 А. B.
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Q: Which one is the least stable carbocation? Select one:
A: Carbocation is planar and sp2 hybridized. It is an electron deficient species. Hence, the stability…
Q: Which group in following pair is assigned the higher priority? −CH2Br, −CH2CH2Br?
A: In R, S nomenclature, the atom or the group which has highest atomic number.
Q: The major product of this reaction exists as two stereoisomers. Draw both isomers. Show all hydrogen…
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Q: with HCl and yields four stereospecific products. Draw the alkene. Upload Choose a File
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A: Answers to both the question are given below.
Q: What type of carbocation is shown?
A: As we can clearly see that the positive charge (cation) containing carbon is attached to two carbon…
Q: 1. Draw the major and minor products. Circle the major product. CH3 CH3-C=C-CH3 H* H20 H. a. C. b.…
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Q: Classify each carbocation as 1°, 2°, or 3°.
A: Primary or 1o carbocation is the carbon in which the positive charge is attached to the carbon which…
Q: Rank the following carbocations from most stable to least stable:
A: Since more is the resonance of +ve charge on Carbon, more it will be delocalised. Hence more will be…
Q: How Electron-withdrawing groups destabilize the carbocation ?
A: The electron withdrawing groups (must contain an electronegative atom) are those which has tendency…
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- 3. Draw the intermediate carbocation that is formed when each is protonated, say, with H*. These occur when adding HBr, HCI, HI, or H*/H2O to a double bond. The rich get richer. will it rearrange? will it rearrange? will it rearrange? will it rearrange? will it rearrange? will it rearrange?What is the relationship (resonance structures, constitutional isomers, conformational isomers, enantiomers, meso compounds, diastereomers, or none of these) between the pair of structures below? 4. а. b. C. CI 5. Circle the most stable conformer of (S)-3,3-dimethyl-2-hexanol. H CH3 CH3 H CH3 (CH2)2CH3 H3C(H2C)2CH3 H3C(H2C)2 CH3 H3C H3C(H2C)2 H3C CH2CH3 CH3 H3C OH H OH H HO, HO CH3 H H,C CH3 ČH2CH3 CH3 6. Circle the compound(s) that is/are optically active (a chiral molecule). (CH2)3CH3 H. HO ČH3 :11 1.2. For the following nucleophilic substitution reaction: NaOC(CH3)3 CH3 'CH3 CH3 a. Draw the first transition state (TS1), the reaction intermediate, and the second m transition state (TS2) in the labeled boxes. Make sure to show any formal charges, unfilled p-orbitals, and correct stereochemistry. TS₁ 41001 Intermediate ogmos TS2 amond- b. Which of three molecules you drew for part 'a' is lowest in energy? Write your answer in the box below. c. Draw the product(s) of the nucleophilic addition reaction shown. Make sure to use wedged and dashed lines to clearly show the resulting stereochemistry at each chiral center. If there is more than one possible product, draw one in each box - if not, leave one box blank. CH3 Br + NaOC(CH3)3
- + 1. Draw line structures of all of the C3H17* carbocations that have the carbon skeleton shown below. 2. Circle the most stable carbocation of those that you have drawn.1) RCO H 2) [H₂SOJ. ? Modify the given structure to draw the major product(s). Use the single bond tool to interconvert between double and single bonds. If a racemic mixture of enantiomers is expected, draw both enantiomers. Note: you can select a structure and use Copy and Paste to save drawing time. H₂C. OH th CH, CH₂ OH H₂C OH aff CH₂ CH₂ Edit Drawing20. Choose the most stable carbonation.a) CH3+b) (CH3)2-CH+c) CH3-CH2-C(H3)2+(d) CH3-CH2+ 21. Choose the most stable carbanion.a) CH3-b) (CH3)2-CH-c) CH3-CH2-C(H3)2-(d) CH3-CH2-
- g. cis-3-methylpent-2-ene with BH3, H2O2, and OH CH3 H3C- CH =C -CH2-CH3 Major Product(s) of g. Stereochemistry of the product described in g. (Circle one) а. R b. S С. Е d. Z e. a mixture of E and Z f. erythro g. threo h. a racemic (50/50) mixture i. all 4 products (a set of erythro and a set of threo) j. no stereochemistryWhich carbocation is more stable? a. H2C=CH+ or HC=C+ b. HC=C+ or CH3CH2+Rank the following carbocations, from least stable (left) to most stable (right). ou oe i. ii. ii. O i. < ii. < ii. O ii. < i. < ii. O iii. < ii. < i. O i. < iii. < ii. O ii. < iii. < i.
- 4. Fill in the missing information (reactants, products, or reagents) in the following transformations. If more than one product is possible, draw structures for all products and indicate the major product. If stereoisomers are possible, draw all isomers, and indicate the major stereoisomer. + a. C. d. e. НО. НО. CI OH OH X PCC NaOCH HBr SOCI J.... CI OH Focus4-bromo-3-ethyl-5-methylcyclohexanone H;C-H,C- H3C- а) b) Br ČH--CH3 Br ČH3 H;C-H,C~ d) Br Br `CH3 e) Both a &b i. d ii. C ii. iv. a5. A. B. C. D. Draw all products (substitution and elimination), including stereoisomers, in each reaction. Label as SN1, SN2, E1, E2. CI J CI & H H HCC₂ Ph ·!|||D III... Br Ph KOH CH₂OH DBU DBN