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- The heat of combustion of cis-1,2-dimethylcyclopropane is larger than that of the trans isomer. Which isomer is more stable? Use drawings to explain this difference instability.Draw all the isomers of C5H₁0. Clearly show stereochemistry if stereoisomers are possible. Step 1: Start by drawing all the isomers with double bonds. • Consider constitutional isomers, then stereoisomers. Step 2: Draw all isomers containing a ring. • Consider constitutional isomers, then stereoisomers. Step 2: Next consider isomers containing a ring. The largest ring possible with this molecular formula contains 5 carbons, while the smallest possible ring contains 3 carbons. Draw an isomer containing a 5-carbon ring. Rings More Select Draw / C H Erase Consider a 4-carbon ring of C5H₁0. Draw stereoisomers, if applicable. Select Draw Rings More C H EraseWhich will be more stable, cis or trans-1,4-tert-butylcyclohexane? Explain by drawing their structures?
- Which of the following statement is false about conjugated systems? A conjugated system is more stable than an unconjugated A system. The s-trans isomer is favored over the s-cis isomer. A conjugated system has C multiple resonance structures. A conjugated system can only D contain two alkenes.Draw the structure of cis-1,2-dimethylcyclohexane. • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • You do not have to explicitly draw H atoms. opy asteIf a catalyst could be found that would establish an equilibrium between 1,2-butadiene and 2-butyne, what would be the ratio of the more stable isomer to the less stable isomer at 25°C? CH,=C=CHCH, CH,C=CCH, AG° = -16.7 kJ (-4.0 kcal)/mol
- Why is a 1, 3 - cis disubstituted cyclohexane more stable than its trans isomer?Draw all constitutional isomers of all-cis ethylmethylisopropylcyclohexane—that is, in which a methyl group (CH3), an ethyl group (CH2CH3), and an isopropyl group [CH(CH3)2] are all bonded to a cyclohexane ring on the same side of the ring’s plane. Which of those isomers do you think is the most stable? ExplainDraw the structure of cis-1,2-dimethylcyclohexane. • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • You do not have to explicitly draw H atoms.
- Draw a structural formula for 2,4-dimethylpentane. You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. CH4 ChemDoodleⓇConstruct the chair structures with the molecular models for trans-1-ethyl-3-methylcyclohexane. Find the energy of each conformer, the equilibrium constant Keq, and the percentage of each conformer at 25oC. Indicate which conformer is more stable.Two alkenes undergo hydrogenation to yield a mixture or cis- and trans-1,4-dimethylcyclohexane. Which two are these? A third, however, gives only cis-1,4-dimethylcyclohexane. What compound is this?