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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

a. Which of the following compounds forms hydrogen bonds between its molecules?

1. CH3CH2OCH2CH2OH 3. CH3CH2CH2CH2Br 5. CH3CH2CH2COOH

2. CH3CH2N(CH3)2 4. CH3CH2CH2NHCH3 6. CH3CH2CH2CH2F

b. Which of the preceding compounds forms hydrogen bonds with a solvent such as ethanol?

What is each compound’s systematic name?

Convert the following Newman projections to skeletal structures and name them.

What is the smallest straight-chain alkane that is a liquid at room temperature (which is about 25 °C)?

a. Calculate the energy difference between the two chair conformers of trans-1,4-dimethylcyclohexane.

b. What is the energy difference between the two chair conformers of cis-1,4-dimethylcyclohexane?
See all solutions

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