Point Group Worksheet Using models, determine the point group for each of the following molecules. If a sketch is not given, draw a VSEPR sketch of the shape of the molecule. H H C=C H. Ha CI C=c H. Br CI H.

1. Pyridine (shown below) is a planar delocalized molecule Similar to benzene H 1) Identify its principal rotation axis (draw it it on picture) 11) Determine its point group and give your resoning / explainin H H C IC H 。 H and label 1211

3. Assign each molecule or ion to its proper point group. a. cyclobutane b. trans-1,3-difluorocyclobutane C. bromoethane d. 1,2-dibromoethane (in the anti conformation)

1. Give the point group for each of the following molecules: H H H CI F F H H. CI BrH BrH Br Br Br Br CI H. Сyclohexane (chaй) Cyclohexane (boat) Ferrocene (staggard) Ferrocene (eclisped) 2. Give the point group for each of the following atomic and molecular orbitals: 88 dy d22 o bond n bond z antibond sp3

On one-electron oxidation of a five valence electron AH₂ compound (C₂, point group) to a closed shell (no unpaired electrons) four valence electron C₂, cationic species, what is the symmetry of the highest energy occupied molecular orbital, and what happens to the energy of this orbital when the four valence electron AH2 C2y cation changes to a Doch geometry? O 2a₁ and stabilised (decreases in energy) O 2a₁ and destabilised (increases in energy) O 1b2 and stabilised (decreases in energy) O b₁ and no change in energy

3. Assign each molecule or ion to its proper point group. a. cyclopropylene b. aziridine (hint: be very mindful of lone pairs) c. NbF,2-