Question

Compare the C-C-C bond angles in propane, gauche butane, and2,2-dimethylbutane. Why are these other C-C-C angles larger thanpropane's? Why are some of these angles small than idealtetrahedral angles?

Explain the change in bond length from strain on C-C bondlengths in butane and t-butylcyclohexane.

Give reasons why the gauche conformation of butane would show alower energy at a dihedral angle great than 60 degrees?

Dihedral angles of the hydrogens at C1 in guache butane were notexactly 60 or 180 degrees. Explain this result.