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Chapter 3: Q.3-44P (page 124)

Verify the strain energy shown in Table 3.8 for cycloheptane.

Short Answer

Expert verified

Strain energy of cycloheptane = actual heat of formation - strain less heat of formation

= 6.2 Kcal/mol

Step by step solution

01

Formula to find Strain energy

The difference between the actual heat of formation and strain less heat of formation is called the strain energy.

Strain energy of cycloheptane = actual heat of formation - strain less heat of formation

02

The strain energy of cycloheptane

From the table-

Actual heat of formation of cycloheptane = -28.2 Kcal/mol.

Strain less heat of formation value for one methyl = -4.29 Kcal/mol.

Cyclohexane contains 7 methyl groups so = 7 x (-4.92) = -34.4 Kcal/mol.

Therefore,

Strain energy of cycloheptane = actual heat of formation - strain less heat of formation

= 6.2 Kcal/mol

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Most popular questions from this chapter

The effectiveness of a barbiturate as a sedative is related to its ability to penetrate the nonpolar membrane of a cell. Which of the following barbiturates would you expect to be the more effective sedative?

Which of the following conformers of isobutyl chloride is the most stable?

Draw the structure for each of the following:

a. 2,2-dimethyl-4-isopropyloctane

b. 2,3-dimethylhexane

c. 4,4-diethyldecane

d. 2,4,5-trimethyl-4-(1-methylethyl) heptane

e. 2,5-dimethyl-4-(2-methylpropyl) octane

f. 4-(1,1-dimethylethyl) octane

a. What is each ether’s systematic name?

b. Do all of these ethers have common names?

c. What are their common names?

a. Draw Newman projections of the two conformers of cis-1,3-dimethylcyclohexane.

b. Which of the conformers predominates at equilibrium?

c. Draw Newman projections of the two conformers of the trans isomer.

d. Which of the conformers predominates at equilibrium?
See all solutions

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