Lecture
From the provided set of balls and rods, assemble models of the molecules of methane, ethane, propane, n-butane, and n-pentane.

Video 7.1.
Rotation around
the C—C bond
In alkane molecules, rotation around carbon-carbon bonds occurs easily (video 7.1). Because of this, the carbon chain of alkane molecules can take on various spatial shapes. By rotating around the carbon-carbon bonds, give the ball-and-stick model of the n-pentane molecule the spatial shapes shown in the figure:

Is the sequence in which the atoms are connected in the molecule disrupted during rotation around carbon-carbon bonds? Are the structures shown in the figure isomers?
Assemble ball-and-stick models of the isomers of n-pentane. Can these models be obtained from the model of n-pentane by rotation around carbon-carbon bonds?
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