Strain Energy for AlkanesInteraction / Compound kJ/mol kcal/molH: H eclipsing4.01.0H: CH3 eclipsing5.81.4CH3 CH3 eclipsing11.02.6gauche butane3.80.9cyclopropane11527.5cyclobutane11026.3cyclopentane26.06.2cycloheptane26.26.3cyclooctane40.59.7(Calculate your answer to the nearest 0.1 energy unit, and be sure to specify units, kJ/mol or kcal/mol. The answer is casesensitive.)H.HPreviousNext

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Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL2: Mass Spectrometry

Section: Chapter Questions

Problem 20CTQ

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Using the average bond strengths below, estimate the molar heat of hydrogenation, AHhydrogenation, for the conversion of C4H6 to C4H10. CH₂=CH-CH=CH₂(g) + 2H₂(g) →→→ CH₂CH₂CH₂CH₂(g) || Bond C-H C=C H-H C-C kJ Bond Strength (kJ/mol) 413 614 436 348
Energy cost Interaction HH eclipsed H CH3 eclipsed Cause Torsional strain (kJ/mol) (kcal/mol) 4.0 1.0 Mostly torsional strain 6.0 1.4 CH3 → CH3 eclipsed Torsional and steric strain 11.0 2.6 CH3 CH3 gauche Steric strain 3.8 0.9 Draw all the newman projections of 2-methylbutane rotated about the C2-C3 bond. What is the difference in energy between the most stable and least stable conformers in kj/mol?
Calculate strain energy for the conformed pictured below, using strain energy increments from the table.
Calculate the enthalpy for the following reaction. CH₂=CH₂ H-CI DH CH2=CH2, 62 kcal/mole H-CI, 103 kcal/mole CH3CH2-H, 101 kcal/mole CH3CH2-CI, 85 kcal/mole CH₂ CH₂ f;
The enthalpy for hydrogenation of different isomers of butene is shown in the following figure. Which statement below best interprets this figure? Hy I3D H2 7k mot 5kJ mot + H2 AH-120 kJ mot AH"-127 kJ mot AH-115 kJ mot © GMU 2020 Stability and hydrogenation enthalpies are not correlated. Butene II is less stable than butene I by 7 kJ/mol. O Butene Il is 7 kJ/mol more stable than I and 5 kJ/mol more stable than III. Butene II is 5 kJ/mol less atable than butene IlI. Enthalpy
Write the structure for the most stable conformer of trans-1-iodo-3-ethylcyclohexane. Calculate the percentages of both conformers at 25 °C from the data below. R=1.99 cal/mol K 5. Free Energy difference between equatorial and axial substituents: Substituent AG 0.4 kcal/mol I CHs 2.1 kcal/mol
I dont know how to find the IUPAC name for these two molecules
Modify the structure of cyclohexane to show 1,1-dimethylcyclohexane. H₂C 1 H₂C CH₂ CH₂ Modify the structure of cyclohexane to show 1,3-dimethylcyclohexane. H₂C | H₂C UI CH₂ 1 CH₂
Use the table of bond dissociation energies to calculate and compare the enthalpy of monobromination and monochlorination for the given alkyl position. Bond Dissociation Energies (for A-B → A •+•B) Bond broken AH (kJ/mol) Bond broken 436 193 243 H-H Br-Br Cl-Cl H CH3CHCH3 + Br₂ H-Br H-Cl AH (kJ/mol) 366 432 Br | CH3CHCH3 + HBr H CH, CHICH CH3CHCH3 + Cl₂ → CH3CHCH3 + HCI AH = AH = Bond broken (CH₂)₂CH-H (CH3)₂CH-Br (CH3)₂CH-Cl AH (kJ/mol) 413 298 355 kJ/mol kJ/mol
Name the last three
١٠
1. Which of the following cycloalkanes would have the smallest strain energy (kJ/mol)? a. cyclobutane b. cyclopentane c. cyclohexane d. cyclooctane Oc d a Ob

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