Electron Pair Arrangements?

Question

Select the following molecular structures which can arise from a tetrahedral electron pair arrangement.

Select all that are true.

 trigonal planar

 T-shaped

 trigonal pyramid

 octahedral

 square planar

Answer 1

In a tetrahedral electronic geometry the only possible answer in your list is trigonal pyramidal. There would be 3 bonded atoms and an unshared pair on the central atom.