а. (i) H (ii) CH, CH, H. H-C- С—Н and Н—С. -с-сн, CH, н H b. () СНз-СH2-CH-CHз and (i) СH3-CH-CH-CHз с. () CН23СНСH-CH2СH3 and (li) CH,CH,CН,СH-CH2
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Identify the nature of following pairs of structures. Write not isomers (same
compound), not isomers (different compounds), constitutional isomers, or
cis-trans isomers.
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- The potential energy of a CH3 group in ethane as it is rotated around the C-C bond can be written V= 1/2V0(1 +cos φ), where φ is the azimuthal angle as shown and V0 = 11.6 kJ mol-1. (a) What is the change in potential energy between the trans and fully eclipsed conformations? (b) Show that for smal lvariations in angle, the torsional (twisting) motion around the C-C bond can be expected to be that of a harmonic oscillator. (d) Estimate the vibrational frequency of this torsional oscil lation.From the enthalpies of reaction2 C1s2 + O21g2¡ 2 CO1g2 ΔH = -221.0 kJ2 C1s2 + O21g2 + 4 H21g2¡ 2 CH3OH1g2 ΔH = -402.4 kJcalculate ΔH for the reactionCO1g2 + 2 H21g2¡CH3OH1g2Uemura and coworkers studied a time dependent Diels-Alder reaction which first formed the endo product as the major organic product and with time produced the exo product (J. Org. Chem. 2018, 83, 9300−9304). Show the endo and exo product for the reaction below. Which is the thermodynamic product and which is the kinetic product? Explain your reasoning.
- Which of the following groups has the highest priority according to the Cahn-Ingold-Prelog sequence rules? a. CH2Cl b. CHO c. CH2OH d. CH3Rank the following groups in order of decreasing priority. −CH=CH2, −CH3, −C≡CH, −HIn which species (NO3- or CH3NO2) are the N-Obond(s) longer? In which species (NO3- or CH3NO2) are the N-Obond(s) weaker?
- 1. Consider the following eqm: SO2(g) + NO2(g) ⇌ NO(g) + SO3(g)What effect will adding SO3 have on the rxn?What effect will removing NO2 have on the rxn? 2. Consider the following exothermic rxn at eqm: C3H8(g) + 5O2(g) ⇌ 4H2O(l) + 3CO2(g)What effect will increasing the temperature have on the rxn?What effect will increasing the pressure have on the rxn?4 what is the ftir interpretation of 1-chloro-1-methylcyclohexane?What is the IR stretching frequencies of C-C stretches of alkenes and alkynes? What are their frequencys in cm^-1 and some commments that can be made about them?