Which of the following Newman projections is the lowest energy conformation of n-pentane? H3C H H A ОА O B C O D H I I H CH3 CH3 CH3 H H CH2CH3 H3CH2C H H H H I I H Η CH2CH3 H B с D CH2CH3 H
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- Which of the staggered conformations of 2-methylbutane is most stable? CH₂ CH₂ H₂CH₂ H CH₂ H CH₂ H₂C CH₂ CH₂ þ þ a o H H H H H HCH: H CH₂ CH₂ H D B Multiple Choice O O A B DWhich Newman projection represents the most stable conformation of 3-methylpentane when viewed down the 2-3 carbon-carbon bond? Hint: Draw the straight chain first!! О O О B (A) None of these C A Н H3C, CH₂CH3 H3C H Н (В) CH3 3CDCH HT H Н H3C, CH₂CH3 (C) Н Н HCO CH CH3 HgC,CH,CH3 (D) H CH3 Н H3C CH3 НIdentify the lowest-energy conformation of this cyclohexane derivative. 'Ңн н!н H HHH ін н -НН н н H/H Н н HH -НН Н HI Н HI H HH н |н н TH- н TH н H
- Identify the type of configurational isomerism that exist for each double bond. E or ZA trisubstituted cyclohexane with three substituents-red, green, and blue-undergoes a ring-flip to its alternate chair conformation. Identify each substituent as axial or equatorial, and show the positions occupied by the three substituents in the ring-flipped form.The following cyclohexane derivative has three substituents-red, green, and blue. Identify each substituent as axial or equatorial, and identify each pair of relationships (red-blue, red-green, and blue- green) as cis or trans.
- Identify each substituent in the following compound as axial or equatorial, and tell whether the conformation shown is the more stable or less stable chair form (green = Cl):Draw the most stable conformation of 1,4-dichlorobutane, using wedges and dashes to represent bonds coming out of the paper and going behind the paper, respectively.Q2