Identify the relationship between the following compounds, (2R,4R)-2,4-dichloropentane and (2R,4S)-2,4-dichloropentane. A. Enantiomers B. identical C. different compounds D. Diastereomers
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- For the given ee values, calculate the percentage of each enantiomer present.a. 90% eeb. 99% eec. 60% eeDraw all the optical isomers of 3-methylhexan-2-ol – you should be able to draw four (two pairs of enantiomers (A+B and C+D) – identify the pairs of enantiomers. Draw a circle around the 2S, 3R isomer.1) Are the molecules A and B... conformational isomers? Diastereomers? Enantiomers? Position isomers? Non-related? 2) What about the molecules B and C? 3) What about the molecules C and D?
- Each H↔H eclipsing interaction in ethane costs about 4.0 kJ/mol. How many such interactions are percent in cyclopropane? What fraction of the overall 115 kJ/mol (27.5 kcal/mol) strain energy of cyclopropane is due to torsional strain.Rank the following groups in order of decreasing priority. −F, −NH2, −CH3, −OHa) Draw the enantiomer of this molecule b) Draw a chiral stereoisomer of this molecule c) Draw the enantiomer of the molecule in part B d) Draw an achiral stereoisomer of this molecule
- Identify the type of configurational isomerism that exist for each double bond or chiral carbon in the structure. Use E-Z system for A and R and S system for B.Draw the enantiomers of 2-methyloxiraneDraw the bond-line formula of 3,4-dimethylhexane. Is geometric isomerism observed in 3,4-dimethylhexane? What structural features must be present for stereoisomers to exist? (4 marks) (b) (1) Using Fischer projection, draw all the stereoisomers of 3-chloro-2-hydroxypentanoic acid. (4 marks) (ii) Assign the chiral centre(s) with R/S configurations in part (b)(i). Indicate which are enantiomers, diastereomers and meso compounds (if any).
- (a) Write the structures of the following compounds and mark them as chiral or achiral. 4 (i) 2-Bromopentane (ii) 3-Bromopentane (iii) 1-Bromo-2-methylbutane (iv) 2-Chloro-3-methylbutane (b) Identify the asymmetric carbon in the chiral compounds. (c) Write the structure of the other enantiomer of the chiral compounds.a. Explain why N-methylethanamine has a higher boiling point than trimethylamine even though they have the same molecular weight b. Explain the observed trend in the melting points for four isomers of molecular formula C7H16What are the configurations for this stereoisomer of 20bromo-3-chlorobutane