40. An E2 reaction can occur from which conformer? CH3 OTS H. OTS H. LOCH3 (A) H₂CO (B) H H CH3 CH3 CH3 OTS CH3. H3C. H H H3CO CH3 (D) (C) H CH 3 H3CO H H OTS
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- a model of cyclohexane in a chair conformation, and explain why the names “axial” and“equatorial’ are appropriate.A7. Which of the following molecules represents the most stable conformation of cyclohexanol? A В C ОН HO- HO. ОН7. Which one of the following conformations of disubstituted cyclohexanes is expected to be the most stable? H,C CH, - CH3 A) B) CH3 CH3 CH, D) CH, CH, OB OD
- 5. Draw the most stable chair conformation of the given trisubstituted cyclohexane? BrWhich of (a)-(d) is the most stable conformation? CH3 H- H CH2CH3 CH3 a) CH3 CH3YYH H CH2CH3 b) CH3 CH3 H CH2CH3 c) H3C H CH CH,CH3 H d)Which chair represents the most stable conformation of Molecule A? A B b D d E e Molecule A Me ..Me 'Me Ме Chair conformations Me a) Me b) c) Me Me Me Me Me Me- -Me Me Ме Me d) Ме e) Ме Me Me- Ме Me Me Me
- 1E.) Which of the following two conformers is lower in energy? Both conformers are of equal enery O A Conformer A is lower in energy. B Conformer B is lower in energy. It cannot be determinedWhat is the most stable chair conformation of the 4-methoxy-1,2- dimethylcyclohexane structure given below? A a B b с с D d OCH: "CH3 H3C 4-methoxy-1,2-dimethylcyclohexane OCH: OCH3 H3C H3C- H3C- OCH3 H3C -OCH3 ĆH: CH3 CH3 CH3 A B DDraw the two chair conformations of the following trisubstituted cyclohexane. ndicate which of the two conformations is the most stable. OH Fl. ""CH3 Cl
- Draw the most stable chair conformation of the following cyclohexane. //1 pomenWhich conformer of pentane is the least stable? CH2CH3 CH,CH3 CH,CH, CH3 HCH,CH; CH H. H H. CH3 H. H. CH3 II III IV Select one: O IV O IIWhy is this chair conformation the most stable trans-1-chloro-3-flurocyclohexane? Wouldn't the conformation with Cl & F in equatorial positions be the most stable conformation?