3 Select the correct representations (using Newman projections) for the staggered rotational isomers ("rotamers") about C2-C3 in 2-methylbutane. H H3C H3C H H3C I I- H H H CH3 H CH3 CH3

Rank the following conformers of 1-propanol in DECREASING order of stability by inserting a number in the box beside the representation - 1 is most stable conformer through to 4 as least stable conformer H H H H Н. H H H SUBMIT CH3 H CH₂ JOH CH3 OH CH OH H 'H H H OH H

Draw the six possible Newman projections for 3-ethylpentane about C2 and C3. Label each drawing (I-VI) Box the most stable Newman projection and justify your answer.

Consider the following Newman projections: CH3 CH3 H. CH3 H. H. CH3 H A В Which of the following statements is/are true? i) Newman projection A and B represent conformers of the same molecule. ii) In both conformers shown, A and B, there is no torsional strain. iii) Newman projection A shows the lowest energy conformer for that molecule. O i only O i and ii only O ii only O i and iii only O i, i and iii

Q8 Conformational Analysis of Cycloalkanes In this question you will look at the conformations of the following molecule: CH3 C В F CH3 D -E A H3C F I II Energy Costs for Interactions in Alkane Conformers: Computed Energy Cost (kJ/mol)* 3.8 Interaction H+H eclipsed H+CH3 eclipsed CH3+CH3 eclipsed CH3+CH3 gauche H»CH(CH3)2 gauche H CH(CH:)2 eclipsed CH3+CH(CH3)2 gauche CH3+CH(CH3)2 eclipsed HeC(CH:)3 eclipsed CH3+C(CH3)3 gauche CH3+C(CH:)3 eclipsed H+I eclipsed I+CH3 gauche I+CH3 eclipsed "Values computed with Gaussian09 using B3LYP/6-31G(d) for structure optimization and B3LYP/6-311+G(2df,3p) for the conformation energy. The calculations were performed in the gas phase (no solvent). *This result for t-butyl is a bit peculiar given that the value is less than that for isopropyl, but there is an explanation that I can tell you about in office hours! 4.8 12.6 3.7 (0.0) 3.1 3.6 17.3 2.8 13.6 18.7 6.7 1.2 15.5 Steric Strain in Monosubstituted Cyclohexanes: 1,3-Diaxial strain Y (kJ/mol)…

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Using the degrees of unsaturation , determine the molecular formula for the following compound (Do NOT subscripts )

Complete the Newman projection below to draw the most stable conformation of 3-methylpentane, looking down the C2-C3 bond. Identify each substituent using "H" for hydrogen and "Me" for methyl. a= b= c= d=

Which of the ff pairs of structure represent resonancr forms, and which do not?

Could you put these into skeletal form? With R and S CH2CH3 CH2CH3 HO. H HO -H H. H -OCH3 CH3 CH2CH2CH3 丰手零 H OH -H -CH2CH3 H F ·CH3 HO Br