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- A chair structure of a disubstituted cyclohexane is shown below. Determine which of the following 2D representations matches the chair structure. II A) I CH3 CH3 CI B) II C) II II CH3 IV H3C CI D) IV CI S..Which of the following molecules contain stereocenters (asymmetric C atoms)? Choose all that apply. O. SH CH3 OHWhat is the maximum number of stereoisomers that can exist for this molecule? Can you help me, please? can you explain to me please?
- Choose the best definition of diastereomers. A) Two molecules with the same molecular formula and identical connections between atoms. B) Two molecules with the same molecular formula, but different connections. C) Two molecules with the same molecular formula and same connections. These two molecules are mirror images that are not superimposable. D) Two molecules with the same molecular formula and same connections. These two molecules are NOT mirror images, but still have a different 3D projection. E) Two molecules that have the same molecular formula and same connections. These molecules differ in their rotation around single bonds.Molecule C shown below contains a group called an allene. An allene has the structure of one central carbon being doubly bonded to two other carbons (C=C=C). Please draw out all of the p-orbitals that are involved in the pi-system for molecule C. b) The p-orbital on carbon 1 in molecule C are not in conjugation with the p-orbital on carbon 2 (ie the p- orbitals are not pointing in the same direction and there is no overlap). Why does this happen?The MOE results and a discussion pertaining to the conformation of Thioflavin T at low potential energies. At low energies, the conformation of ThT cannot be coplanar, that is, the dihedral angle cannot be 0. Why not?
- True or False: It is possible for a molecule to have a mirror plane that is parallel to the principal rotation axis, and a mirror plane that is perpendicular to the principal rotation axis. (If true, give an example. If false, briefly explain why.)Answer the following question for 1,3,5- hexatriene, the conjugated triene containing six carbons. Which MOs are the frontier molecular orbitals?Which of the following molecules are chiral? H and
- Compounds with several chiral centres may have configurations referred to as meso. Meso configurations arise when the molecule can adopt a configuration with an internal mirror plane. When this occurs, the mirror image of a molecule with an internal mirror plane is an identical configuration. Thus, even though the molecule may possess several chiral centres, they are reflection of each other (within the molecule) thus resulting in an achiral meso form. This occurs for example for tartaric acid (Figure 3.1). Because of this, tartaric acid only has three stereoisomers instead of four. It has the two chiral (R,R) and (S,S) enantiomers, and the meso form. Figure 3.1. Stereoisomers of tartaric acid. Given the information above on meso forms, how many different stereoisomers do compounds A to D (Figure 3.2) have? Figure 3.2. Structure of compounds A, B, C and D.How many kinds of H’s are there in the isomers of dimethylcyclopropane? Draw theirstructures and assign the different protons as a, b, c, etc.Assign a point group to each of the molecules below. Determine is the molecule is chiral be drawing its reflection and determining it can overlap with the original. Note 4. whether it is chiral or not.