For each of the following molecules (i) list all the symmetry elements and (ii) provide the point group. a a ||||| a 1-6 (b) * a a M-|||| 6 (c) a (d)
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- Structural isomers can have very different point groups. There are three isomers of dichlorobenzene. Identify the point groups of the three isomers.4. For each of the following molecules (i) list all the symmetry elements and (ii) provide the point group. b *** M-|||| 6 (b) (c) a (d) a1. Using VSEPR, determine the shape of the molecules, symmetry elements/operation and assign the point group: (a) CCI4 (b) H2C=CH2 (c) CO2 (d) Co,2
- Indicate the point group of the following ions. Provide molecular structures and indicate the symmetry elements to support your answers. (a) BF2Cl (b) N2OList the symmetry elements of the following molecules and name the point groups to which they belong: (a) staggered CH3CH3, (b) chair and boat cyclohexane, (c) B2H6, (d) [Co(en)3]3+, where en is 1,2-diaminoethane (ignore its detailed structure), (e) crown-shaped S8. Which of these molecules can be (i) polar, (ii) chiral?(a) Identify the symmetry elements in ethene and in allene, and assign each molecule to a point group. (b) Consider the biphenyl molecule, Ph–Ph, in which different conformations are possible according to the value of the dihedral angle between the planes of the two benzene rings: if this angle is 0°, the molecule is planar, if it is 90°, the two rings are perpendicular to one another. For each of the following dihedral angles, identify the symmetry elements present and hence assign the point group: (i) 0°, (ii) 90°, (iii) 45°, (iv) 60°.
- (ii) List and depict all the symmetry elements and deduce the point group. NH2 N' NH2 BConsider the octahedral species CrCl63- (point group Oh). What point group results by (a) removing one Cl (b) replacing one Cl with one Br (c) removing two trans Cl’s5. (a) Deduce the point group of the follo species : OH (i) HO HO, (ü) Co4(Cp)4 (iüi) PF3CI2 (one Cl axial and one Cl equatorial)
- Consider the octahedral species CrCl63- (point group Oh). What point group results by (d) removing two cis Cl’s (e) removing three mutually adjacent Cl’s.What is the point group of CIOF4" (Cl is the central atom)?(a) Which is the acid and which is the base in the reaction? Explain using the appropriate acid / base definitions. (b) A proton is defined as a hard acid. What does this tell you about the properties of [Si9]4-? Explain. (c) [Si9]4- belongs to point group C4v. 1. Describe what will happen to the symmetry elements if one of the atoms is replaced with carbon, as seen in the following figures: (specify which symmetry elements are lost) 2. Is either A or B chiral? Explain. (d) Using Wade's rules, predict the cluster structure of [Si9]4-. Which borohydride cluster is identiical to the [Si9]4-cluster structure? explain.