Which of the following structures have a plane of symmetry?

Question

Quizplus · Accepted Answer

A plane of symmetry is a plane that can divide a molecule into two identical halves. 
1) The structure 11ea7d75_f5e0_fdff_b9bd_df1a58d44214_TB1813_00_TB1813_00 does not have a plane of symmetry as there is no plane that can divide it into identical halves.
2) This structure does not have a plane of symmetry as well. 
3) This molecule has a plane of symmetry as it can be divided into identical halves by a plane that is perpendicular to the plane of the paper and bisects the C-C bond.
4) This molecule has a plane of symmetry that passes through the S and C atoms and bisects the two C-S bonds.

Therefore, only structures 3 and 4 have a plane of symmetry, making choice C the correct answer.

Which of the Following Structures Have a Plane of Symmetry