Which of the following molecules possesses a plane of symmetry?

1.A only
2.B only
3.C only
4.A and C
5.B and C
Question 2What are the relative geometries of ring fusions (starting from the left) for the steroid shown below?

1.cis, cis, cis
2.cis, cis, trans
3.cis, trans, trans
4.trans. cis, cis
5.trans, trans, cis
Question 3Which of the above will have the highest energy after the chair flip?

1.a
2.b
3.c
4.d
5.e
Question 4Dipole moments usually are measured on collections of molecules, and represent average values for all conformations present. Which of the following collections of molecules will not show a dipole moment?
1. 1,2-dibromoethane
2. trans-1,2-dibromocyclohexane
3. cis-1,2-dibromocyclohexane
4. cis-1,4-dibromocyclohexane
5. trans-1,4-dibromocyclohexane