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- Consider the octahedral species CrCl63- (point group Oh). What point group results by removing one Cl replacing one Cl with one Br removing two trans Cl’s removing two cis Cl’s removing three mutually adjacent Cl’s.7. The following character table (accompanied by a molecule of the corresponding point group) has some missing information. E 2 C3 3 C2 ? 2 S3 3 oy X1 1 1 1 1 1 x2+ y?, z2 A2 1 1 -1 1 -1 Rz E' 2 -1 2 -1 (х, у) (x2- у?, ху) A," 1 X2 1 -1 -1 -1 A2" 1 1 -1 -1 -1 1 X3 BH3 E" 2 -1 -2 1 (Rx, Ry) (zx, yz) а. Based on symmetry labels and Mulliken symbols, what is the missing symmetry element? b. Provide the missing information in the table: i. X1 = ii. X2 = iii. X3 = С. For this point group, what is the symmetry of the following orbitals for an atom located along the main C3 axis? i. А Рх orbital: ii. A d,? orbital: iii. A dxy orbital:For each of the following, write all symmetry elements and classify by point group Br Clas cl X Cl CI F F 113s H H CI NBr Se CI Br CI CI C/ CI F Cl CI
- What is the point group, chirality and polarity of 1-bromobenzene, 1,2,3-tribromobenzene, 1,4-dibromobenzene, 1,3,5, tribromobenzene, perbromobenzene?Determine the Ka for CH 3NH 3* at 25 °C. The Kb for CH 3NH 2 is 4.4 x 10 -4.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.
- determine the point group for CI 0-1² I CI ن CIWhat is the point group of this molecule? O D4 D4d D4h Td Oh Ih Cannot be determined5. The most stable structure for N₂O4 is planar and belongs to the D2h point group, which has the character table shown below. D2h E C₂(X) C₂(V) C₂ (2) i o(xy) o(yz) o(x2) Ag 1 1 1 1 1 1 1 1 B1g 1 1 -1 -1 1 1 -1 -1 1 -1 -1 1 -1 1 1 -1 1 1 -1 -1 1 1 1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 1 -1 1 1 B2g B3g Au B1u 1 B2u 1 B3u 1 1 -1 1 -1 1 -1 -1 1 -1 1 1 -1 5.1 How many translational degrees of freedom does N₂04 have? 5.2 How many rotational degrees of freedom does N₂04 have? 5.3 How many normal modes of vibration does N204 have? x², y², z² xy 5.5 How many of the vibrational modes of N₂04 are IR-active? XZ yz 5.6 How many of the vibrational modes of N₂O4 are Raman-active? Z y X Rz Ry Rx 3. 5.4 The displacement vectors for the atoms of N₂O4 span 3Ag + 3B1g + 2B2g + B3g + Au + 2B1u + 3B2u + 3B3u. What are the symmetry species of the normal modes of vibration? ☐☐☐
- Can you interpret the CNMR any further?Structural isomers can have very different point groups. There are three isomers of dichlorobenzene. Identify the point groups of the three isomers.Consider the three following molecules and answer the questions below.HC≡CHH2C=CH2H3C-CH3 (3 conformers with different symmetry)(a) For each molecule, including all conformers as indicated, draw the molecule, assign it toits point group, and draw on the diagram the symmetry elements that were used to makethe assignment. State in each case whether or not the species is dipolar and/or chiral.(b) If one hydrogen atom in each molecule is substituted by a chlorine atom, sketch the newmolecules and assign them to their point group. For this set of mono-chloro compounds: state the most common point group state how many are chiral state how many are dipolar state which molecule/conformer has the highest symmetry point group state which molecule/conformer has the lowest symmetry point group identify which of these molecules/conformers have three different H atomenvironments(c) For the dichlorinated versions of the molecules/conformers considered in part (a): state the most common point…