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- There are four dimethylcyclopropane isomers. (a) Write three-dimensional formulas for these isomers. (b) Which of the isomers are chiral? (c) If a mixture consisting of 1 mol of each of these isomers were subjected to simple gas chromatography, how many fractions would be obtained and which compounds would each fraction contain? (d) How many of these fractions would be optically active? tod o ors brie page 10 of 171) Mark the chiral centers in the following molecules, if any, with an asterisk (*). (b) (a) НО НО НО ОН 0 OH (c) (d) *H3N-H HOT -С-0 HC-CH3 CH3 ОНWhat is the stereochemical configuration of the enantiomer of (2S, 4R)-2, 4-octanediol? (A diol is a compound with two —OH groups.)
- 1) Mark the chiral centers in the following molecules, if any, with an asterisk (*). (b) (a) НО HO HO OH OH (c) (d) *H₂N- НО HC CH3 CH3 c-0 О None OH(a) Identify type of molecules either chiral, achiral, or meso for each compound shown below and (b) Indicate the number of chiral centers in each molecule.- с app.101edu.co Identify which of the following compounds is meso. I H₂CO H III H C H₂CO HCI Н A) 1 B) II Question 52 of 67 C) III D) IV OCH H₂CO "CH3 H C H CH₂ OCH₂ IV Н H₂CO H.C Н OCH, "H CH3 CH3 OCH₂ S В Sub
- What is the configuration of the carbon atom indicated by the dot? (a) R (b) S (c) Not a chiral center HO Im OHIdentify the relationship between the following pair of structures by describing them as represting enantiomers, diastereomers, constitutional isomers or two molecules of the same compounds (a) (c) H H₂C H F Br Oll F CH3 Br H and Br. CH3 H and Fumus (d) H H X-X=-= CH3 H CH3 (b) Br HO CHO and -OH H C(O)CH3 and HO H- CHO -H -OH C(O)CH3(c) CH3 0 1. LIAIH4 H2C=CHCHCH2COCH3 2. H2O
- 4. (a) Draw all possible isomers of C4H3CI2. (b) Indicate which pairs of compounds are enantiomers of one another. (c) Indicate which pairs of compounds are diastereomers of one another. (d) Indicate which compounds would have optical rotations of 0°. (e) Assign R and S configurations to all chirality centers of the compounds in part (a).(a) Is the compound CH3CH≡CH2 saturated or unsaturated?Explain. (b) What is wrong with the formulaCH3CH2CH≡CH3?(9) How many chiral centers are present in a molecule of 1,3-dimethylcyclohexane? (C) 2 (D) 3 1 (A) O (10) What is the percent composition of a mixture of (S)-(+)-2-butanol, [a] = +13.52°, and (R)-(-)-2-butanol, [a] = -13.52°, with a specific rotation [a]D = -6.76° (A) 75%R 25%S (B) 25%R 75%S (C) 50%R 50%S 67%R 33%S