CHEM 2370 Exam 2 Review

• I<II<III<IV

• II<III<I<IV

• IV<I<III<II

• IV<II<I<III

•  I, II and V

• II and V

• III and IV

• V only

• I

• II

• II

• IV

• V

The preferred conformation of cis-3-tert-butyl-1-methylcyclohexane is the one in which:

• the tert-butyl group is axial and the methyl group is equatorial.

• the methyl group is axial and the tert-butyl group is equatorial.

• both groups are axial.

• both groups are equatorial.

• constitutional isomers.

• enantiomers.

• identical.

• diastereomers.

• not isomeric.

Hexane and 3-methylpentane are examples of:

• enantiomers.

• stereoisomers.

• diastereomers.

• constitutional isomers.

Consider the graph, which is a plot of the relative energies of the various conformations of 2,3-dimethylbutane, viewed through the C-2—C-3 bond.  The conformations corresponding to the 120^o and 240^o are:

• eclipsed, more stable than the conformation at 0^o

• eclipsed, more stable than the conformation at 180^o

• staggered, more stable than the conformation at 0^o

• staggered, less stable than the conformation at 180^o

• I

• II

• III

• II and III

• I and II

• enantiomers.

• diastereomers.

• constitutional isomers.

• identical.

• I and II

• II and III

• III and IV

• III and V

• IV and V