9. Use the molar heats of hydrogenation tables of alkenes to predict the difference in energy between 2,3-dimethyl-but-1...
9. Use the molar heats of hydrogenation tables
of
alkenes to predict the difference in energy between
2,3-dimethyl-but-1-ene and 2,3-dimethyl -but-2-
eno (draw skeletal formulas). Which one is more stable?
Homework Answers
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9. Use the molar heats of hydrogenation tables of alkenes to predict the difference in energy between 2,3-dimethyl-but-1...
Recall that Zaitsev’s rule says that more substituted alkenes are more stable. Therefore, propene is less...
Recall that Zaitsev’s rule says that more substituted alkenes are more stable. Therefore, propene is less stable than trans-but-2-ene, which is less stable than 2-methylbut-2- ene, which is less stable than 2,3-dimethylbut-2-ene. In Chapter 7, we showed that we could demonstrate this stability ordering by using heats of hydrogenation. a) Does the same apply for other groups, besides alkyl groups? For example, compare the stability of propene, trans-but-2-ene and trans-1-chloroprop-1-ene to compare the effects of adding a chlorine instead of...
Passage 11 (Questions 1-9) Dienes, a special group of alkenes, can be classified as conjugated or...
Passage 11 (Questions 1-9) Dienes, a special group of alkenes, can be classified as conjugated or isolated. Conjugated dienes are alkenes with alternating double and single bonds. Isolated dienes have double bonds separated by more than one single bond. One explanation for this observation is the hybridization theory. According to the hybridization theory, the stability of conjugated dienes comes from the hybridization of the orbitals forming the carbon-carbon single bonds. For example, in 1,4-pentadiene, the C-C single bonds result from...
Need help with the questions Circle the compound with the highest heat of combustion 2,3-dimethyl-2-butene 2-methyl-2-pentene...
Need help with the questions
Circle the compound with the highest heat of combustion 2,3-dimethyl-2-butene 2-methyl-2-pentene (E) 2-hexene (Z) 2-hexene (Z) 3-methyl-2-pentene 8. What are the three hydration reactions for alkenes? What is the regiochemistry for each one? Which one(s) do(es) not go through a carbocation intermediate? 9. 10. Which compound below is more reactive towards E2 elimination? Neomenthyl Chloride Menthyl Chloride Cyclohexane 11. Draw the following structures Acetylene Acetylide lon Part 2. Roactions (Each structure is worth 5 points)....
1. Draw all constitutional isomers formed in the elimination reaction and predict the major product using...
1. Draw all constitutional isomers formed in the elimination reaction and predict the major product using the Zaitsev rule. A . KOCICH ! KOC(CH) 2. Draw all possible elimination reaction product(s) for the following alkyl halide. 4. Classify the following alkenes as mono, di-, tri, or tetra- substituted alkenes. Then, circle the most stable one. thayo by my 5. Which of the following alkenes is more stable?
Laboratory Work 1. Draw the skeletal formulas and make models of the three constitutional isomers of...
Laboratory Work 1. Draw the skeletal formulas and make models of the three constitutional isomers of C5H12. 2. Draw Kekule structures and make models of all the constitutional isomers of C2H4Cl2. 3. Draw Kekule formulas and make models of ethane, ethene, and ethyne. How does the geometry of their structures differ? Which compound contains sp hybridized carbons? 4. Draw and label the Newman projection and make the model of the anti-conformation of 1,2-dibromoethane. Rotate around the carbon-carbon bond...
9. Draw two different chair conformations of cyclohexanol, showing all hydropen atoms. Identify each position as...
9. Draw two different chair conformations of cyclohexanol, showing all hydropen atoms. Identify each position as axial or equatorial 10. Draw the most stable chair conformation of the following molecules, and estimate the amount of strain in each: (a) trans-1-Chloro-3-methylcyclohexane (b) cis-1-Ethyl-2-methylcyclohexane (c) cis-1-Bromo-4-ethylcyclohexane (d) cis-1-tert-Butylcyclohexane 11. Which isomer is more stable, cis-decalin or trans-decalin? Explain. 12. Glucose exists in two forms having a 36:64 ratio at equilibrium. Draw a skeletal structure of each, describe the difference between them and...
3. For a) [CH3CH2C(-O)CH2l b) [CH3NHCHCHCH21 1) Draw their possible resonance forms as the Line-Angular structure. 2) Predict the product of the acid-base reaction between more stable resonance forms...
3. For a) [CH3CH2C(-O)CH2l b) [CH3NHCHCHCH21 1) Draw their possible resonance forms as the Line-Angular structure. 2) Predict the product of the acid-base reaction between more stable resonance forms. Use the curved arrow to show the movement of electrons 3) Predict the product of the acid-base reaction between less stable resonance forms. 4) After comparing the reaction mechanisms and its products of 2) and 3). describe your opinion on the difference of stability of product.
3. For a) [CH3CH2C(-O)CH2l b)...
1.Predict all the products for the following reaction. Which is the major product? Why? + conc....
1.Predict all the products for the following reaction. Which is the major product? Why? + conc. H2SO4 heat OH 2. Give an alcohol that you could use to synthesis each of the following alkenes? din 3.Draw the mechanisms for the following two schemes (two separate mechanisms). Only show the mechanism for the most stable product for each scheme. What is the key difference in the mechanistic steps between these two reactions? ОН ОН conc H2SO4 conc H2SO4 heat heat
Application Questions 1. Predict all the products for the following reaction. Which is the major product?...
Application Questions 1. Predict all the products for the following reaction. Which is the major product? Why? conc. H2SO4 heat OH 2. Give an alcohol that you could use to synthesis each of the following alkenes? o in s 3. Draw the mechanisms for the following two schemes (two separate mechanisms). Only show the mechanism for the most stable product for each scheme. What is the key difference in the mechanistic steps between these two reactions? ОН conc H2SO4 heat...
need the answer to the question: calculate the difference in energy between the axial and equatorial...
need the answer to the question:
calculate the difference in energy between the axial and equatorial
conformations.
VII. Calculations of the Conformations of Substituted Cyclohexanes In this exercise, you will examine the conformational equilibrium between axial and equatorial methylcyclohexane. Begin by drawing a methylcyclohexane using ChemDraw. Don't forget about the rings shown at the bottom of the toolbar. Chem3D will automatically put the methyl group in the low energy equatorial conformation. Minimize the energy using the calculations) menu. Select MM2...
Passage 11 (Questions 1-9) Dienes, a special group of alkenes, can be classified as conjugated or isolated. Conjugated dienes are alkenes with alternating double and single bonds. Isolated dienes have double bonds separated by more than one single bond. One explanation for this observation is the hybridization theory. According to the hybridization theory, the stability of conjugated dienes comes from the hybridization of the orbitals forming the carbon-carbon single bonds. For example, in 1,4-pentadiene, the C-C single bonds result from...
Need help with the questions
Circle the compound with the highest heat of combustion 2,3-dimethyl-2-butene 2-methyl-2-pentene (E) 2-hexene (Z) 2-hexene (Z) 3-methyl-2-pentene 8. What are the three hydration reactions for alkenes? What is the regiochemistry for each one? Which one(s) do(es) not go through a carbocation intermediate? 9. 10. Which compound below is more reactive towards E2 elimination? Neomenthyl Chloride Menthyl Chloride Cyclohexane 11. Draw the following structures Acetylene Acetylide lon Part 2. Roactions (Each structure is worth 5 points)....
1. Draw all constitutional isomers formed in the elimination reaction and predict the major product using the Zaitsev rule. A . KOCICH ! KOC(CH) 2. Draw all possible elimination reaction product(s) for the following alkyl halide. 4. Classify the following alkenes as mono, di-, tri, or tetra- substituted alkenes. Then, circle the most stable one. thayo by my 5. Which of the following alkenes is more stable?
9. Draw two different chair conformations of cyclohexanol, showing all hydropen atoms. Identify each position as axial or equatorial 10. Draw the most stable chair conformation of the following molecules, and estimate the amount of strain in each: (a) trans-1-Chloro-3-methylcyclohexane (b) cis-1-Ethyl-2-methylcyclohexane (c) cis-1-Bromo-4-ethylcyclohexane (d) cis-1-tert-Butylcyclohexane 11. Which isomer is more stable, cis-decalin or trans-decalin? Explain. 12. Glucose exists in two forms having a 36:64 ratio at equilibrium. Draw a skeletal structure of each, describe the difference between them and...
3. For a) [CH3CH2C(-O)CH2l b) [CH3NHCHCHCH21 1) Draw their possible resonance forms as the Line-Angular structure. 2) Predict the product of the acid-base reaction between more stable resonance forms. Use the curved arrow to show the movement of electrons 3) Predict the product of the acid-base reaction between less stable resonance forms. 4) After comparing the reaction mechanisms and its products of 2) and 3). describe your opinion on the difference of stability of product.
3. For a) [CH3CH2C(-O)CH2l b)...
1.Predict all the products for the following reaction. Which is the major product? Why? + conc. H2SO4 heat OH 2. Give an alcohol that you could use to synthesis each of the following alkenes? din 3.Draw the mechanisms for the following two schemes (two separate mechanisms). Only show the mechanism for the most stable product for each scheme. What is the key difference in the mechanistic steps between these two reactions? ОН ОН conc H2SO4 conc H2SO4 heat heat
Application Questions 1. Predict all the products for the following reaction. Which is the major product? Why? conc. H2SO4 heat OH 2. Give an alcohol that you could use to synthesis each of the following alkenes? o in s 3. Draw the mechanisms for the following two schemes (two separate mechanisms). Only show the mechanism for the most stable product for each scheme. What is the key difference in the mechanistic steps between these two reactions? ОН conc H2SO4 heat...
need the answer to the question:
calculate the difference in energy between the axial and equatorial
conformations.
VII. Calculations of the Conformations of Substituted Cyclohexanes In this exercise, you will examine the conformational equilibrium between axial and equatorial methylcyclohexane. Begin by drawing a methylcyclohexane using ChemDraw. Don't forget about the rings shown at the bottom of the toolbar. Chem3D will automatically put the methyl group in the low energy equatorial conformation. Minimize the energy using the calculations) menu. Select MM2...
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