5.66 A mixture contains equal amounts of compounds A-D. a D B A a. Which compounds alone are optically active? b. If the mixture was subjected to fractional distillation, how many fractions would be obtained? c. How many of these fractions would be optically active?
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- The sample that has no effect on the plane polarised light is a solution of (2S,3R)-diaminebutane (2S,3S)-diaminebutane (2R,3R)-diaminebutane An equimolar mixture of a & b a. b. C. d.How many stereogenic carbons are there in zuranolone? A. 2 B. 4 C. 6 D. 8 zurandone CN10. Provide unambiguous structural formulas for reaction products A, B, and C. Br 1) I (2 eq.) 2) B(OMe)3 Pd(PPhala Grubbs cat. B
- A. B. C. Me CH3 ClC H ¿ OH NH₂ H Br-C-C H3C H Br CH3 Comparing structure pair in B OH Comparing structure pair in C [Select] Me HC CI Comparing structure pair in A [Select] [Select] Same structure drawn differently Enantiomers Diastereomers NH₂ Br H3C CH3 Br HC-CCH3 H For the following two structures compared in parts A and B, determine whether they are enantiomers OR diastereomers OR the same structure drawn differently (non-bonding electrons not included for clarity).Compare the physical properties of the three stereoisomers of 1,3-dimethylcyclopentane. a.How do the boiling points of A and B compare? What about those of A and C? b. Characterize a solution of each of the following as optically active or optically inactive: pure A; pure B; pure C; an equal mixture of A and B; an equal mixture of A and C. c.A reaction forms a 1:1:1 mixture of A, B, and C. If this mixture is distilled, how many fractions would be obtained? Which fractions would be optically active and which would be optically inactive?59. Bond Strength I. Cyclobutane II. Cyclopentane 60. Optical Rotation I. 70% R, 30% S 11.30% R, 70% S 61. Which of the following is/ are alternant aromatic compounds? A. benzene B. naphthalene C. anthracene D. all of the given choices 62. Which of the following is/ are not aromatic? A. Cyclobutadiene B. Cyclopentadiene C. Cyclohexadiene D. All of the given choices 63. The following can exhibit tautomerism EXCEPT: A. benzaldehyde B. ethanal C. Cyclohexane carbaldehyde D. Cyclohexanone 64. Which of the following substituents exhibits both - inductive effect and - Resonance effect when attached to the benzene ring? A. -OH B. -CI D. -NO2 D.-CH3 65. Alkyl groups if attached to halogen (example: tert-butyl bromide) would exhibit A. negative inductive effect B. positive inductive effect C. negative resonance effect D. positive resonance effect. 9
- 1. Write out all the isomers of the compound with molecular formula C,H19O a. Select the normal/ primary isomer and treat it with conc. H2SO4 and heat. Identify the reaction and give the product 'A' from it. b. Treatment of 'A' with HCl/H;O gives 'B' c. Treatment of 'A' with cold KMN04/ -OH gives 'C' Treatment ofA'rith Hot MB04-OH girer D: felleured by egidifiention of theYou have a solvent mixture of acetone (b.p. 56 ° C) and methyl alcohol (b.p. 65 ° C), what kind of distillation technique you need to use to separate them? (b.p. : boiling point) , Simple distillation Steam distillation Vacuum distillation Fractional distillationWhich two compounds, when mixed in equimolar amounts, would make a solution that is NOT optically active? СООН COOH ÇOOH СООН H- -OH Но- но- -H H- -CI H- CI H- -CI CI- -H H- -O- ČH3 ĆH3 IV a. I and II b. I and III c. I and IV d. III and IV The specific rotation of pure (R)-carvone is -61°. An enantiomeric mixture of (R) and (S) carvone has an observed rotation of +10°. Which enantiomer is in excess? b. (S)-carvone d. Cannot be determined a. (R)-carvone c. Neither, they have equal amounts
- Which of the following would be considered optically active: a. a solution of 50:50 (R)-2-bromobutane and (S)-2-bromobutane b. a solution of (2R,3S) -2,3-dibromobutane c. a solution containing only (S)-2-bromobutane d. a solution of 2,2-dibromobutaneBr. CH, 21. C%3DC H. CH, The compound above can exhibit a. cis-isomerism only Ob. trans-isomerism only Oc. both cis- and trans-isomerism Od. neither cis- nor trans-isoherismGive the relationship between the pair of molecules below by selecting from the choices below: A. EnantiomersB. Diastereomers (Geometric)C. Diastereomers (Configurational) D. ConstitutionalIsomers–SkeletalE. Constitutional Isomers – Functional F. Constitutional Isomers