4. Alkanes and Cycloalkanes

Determine if the following pair of molecules isisomers or conformers?

Determine if the following pairof molecules is isomers or conformers?

Determine if the following pairof molecules is isomers or conformers?

Determine if the following pairof molecules is isomers or conformers?

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

In Chapter 8, we study the chemistry of alkenes, like ethene. In contrast to ethane, there is no free rotation around the C = C double bond of ethene. Explain this in the context of the molecular orbital picture of ethene.

In contrast to ethane and other alkanes studied in this chapter, there is no free rotation around any bonds in cyclopentane (shown below). Why?

For rotation about the C-3---C-4 bond of 2-methylhexane, do the following:

c. About which other carbon–carbon bonds may rotation occur?

d. How many of the carbon–carbon bonds in the compound have staggered conformers that are all equally stable?

Although there is free rotation around most σ bonds, rotation is restricted around the C--N bond of an amide. Explain why this is true.