Identifying Conformer Representations

In each of the following four questions a hydrocarbon is named. For each select from among the sixteen conformational structures A through P all structures that represent possible conformers of that compound.

Enter letters (A through P), corresponding to your selections, in each answer box.
Do not enter superfluous characters, since they will be counted as incorrect answers.

1.  2-methylbutane   2.  2,3-dimethylpentane   3.  1-ethyl-1,3-dimethylcyclohexane   4.  2-ethyl-1,1-dimethylcyclohexane

This script written by William Reusch, Dept. of Chemistry, Michigan State University. Please send comments and corrections to