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Chapter 3: Q9P (page 153)

Without looking at the structures, give molecular formulas for the compounds in Problem 3-8 (a) and (b). Use the names of the groups to determine the number of carbon atoms; then use the (2n+2) rule.

Short Answer

Expert verified

(a)C13H28

(b)C16H34

Step by step solution

01

General concept

The general rule to write the molecular formulae for the compound is 2n+2 rule, where n represent the number of carbons and 2n+2 equals to the number of hydrogen.

02

(a)

4-(1,1-dimethylethyl)nonane: Total number of carbon atoms(n) = 13 (9 from nonane +2 from dimethyl + 2 from ethyl)

Therefore, As per 2n+2 rule number of hydrogen atoms = 2(13)+2 = 28

03

(b)

5-(1,2,2-trimethylpropyl)decane:Total number of carbon atoms(n) = 16 (10 from decane +3 from trimethyl + 3 from propyl)

Therefore, As per 2n+2 rule number of hydrogen atoms = 2(16)+2 = 34

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Most popular questions from this chapter

Which of the following structures represent the same compounds. Whichof the following compounds represents different ones.

(a)

(b)

(c)

Draw the two chair conformations of each compound, and label the substituents as axial and equatorial. In each case, determine which conformation is more stable.

(a)cis-1-ethyl-2-isopropylcyclohexane

(b)trans-1-ethyl-2-isopropylcyclohexane

(c)cis-1-ethyl-3-methylcyclohexane

(d)trans-1-ethyl-3-methylcyclohexane

(e)cis-1-ethyl-4-methylcyclohexane

(f)trans-1-ethyl-4-methylcyclohexane

Use your models to do a chair-chair interconversion on each ring of the conformation of cis-decalinshown in Figure 3-27. Draw the conformation that results.

Draw a perspective representation of the most stable conformation of 3-methylhexane.

Using what you know about the conformational energetics of substituted cyclohexanes, predict which of the two 9-methyldecalinisomers is more stable. Explain your reasoning.
See all solutions

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