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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

Which has

a. the higher boiling point: 1-bromopentane or 1-bromohexane?

b. the higher boiling point: pentyl chloride or isopentyl chloride?

c. the greater solubility in water: 1-butanol or 1-pentanol?

d. the higher boiling point: 1-hexanol or 1-methoxypentane?

e. the higher melting point: hexane or isohexane?

f. the higher boiling point: 1-chloropentane or 1-pentanol?

g. the higher boiling point: 1-bromopentane or 1-chloropentane?

h. the higher boiling point: diethyl ether or butyl alcohol?

i. the greater density: heptane or octane?

j. the higher boiling point: isopentyl alcohol or isopentylamine?

k. the higher boiling point: hexylamine or dipropylamine?
  1. Draw all the staggered and eclipsed conformers that result from rotation about the C-2_ C-3bond of pentane.
  2. Draw a potential-energy diagram for rotation about the C-2_C-3bond of pentane through 3600, starting with the least stable conformer.

What is each compound鈥檚 systematic name?

For each of the following, give the systematic name and the common name (if it has one) and then indicate whether it is a primary, secondary, or tertiary amine.

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?
See all solutions

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