Rank the following from most to least stable. A. A, B, C B. C, B, A C. B, C, A D
ID: 520110 • Letter: R
Question
Rank the following from most to least stable. A. A, B, C B. C, B, A C. B, C, A D. B, A, C Rank the following from most to least stable. A, B, C, A B. C, B, A. C. A, B, C D. B, A, C Which of the following is the most reactive in an E2 reaction? Which of the following is the major product of the following elimination? Which of the following is the major product of the following elimination? Which of the following would be the best base for performing the following elimination? A. H_2O B. HBr C. KOMe D. KOtBu Which of the following would be the best base for performing the following elimination? A. H_2O B. HBr C. KOMe D. KOtBuExplanation / Answer
1. B is most stable, then C and then A. B is most substituted and hence most stabilised by 8 no-bond resonance, C with 6 no bond resonance and A with 3,
Therefore correct order: C. B,C,A
2.More substituted alkene B or C is more stable, it can also participate with resonance with alcohol.(I think that both B and C are same molecule), hence the correct option may be
A. B,C,A or B. C,B,A
3. The best candidate for E2 is primary halide since it is one step mechanism
Answer A
4. trans-2-butene would be major pdt, since E2 elimination goes with anti periplanar arrangement, so anti H is lost along with Br
Answer: A
5. If we use bulky base, then Hoffmann pdt is the major pdt. The bulky base cannot approach the H from interior and abstracts a H from side Carbon C-1 forming less substituted alkene.
Answer : C
6. We can use KOMe since this is normal E2 type reaction, we want the more substituted alkene hence use a conventional (not bulky) base.
Ans : C
7. Since we want less substituted terminal alkene, it is best to use bulky base KOtBu
Ans: D
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