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- (a) Classify each of the following pairs of structures as constitutional isomers, conformational isomers, configurational isomers or identical. Br and Br Br NH, CH, HO но H,C. ii. and CH, CH, Vi. and он Ph CH, он CH, Ph iv. and3. For each of the following pairs of structures, indicate whether the structures are (a) constitutional isomers, (b) stereoisomers, or (c) the same compound (a) CH3CH2CH(CH3)2 and (CH3)3CCH3 Constitutional isomers (b) O (d) (e) (f) H3C. H3C CH₂CH3 H H H CH₂ and and and and and H H CH3 H CH3 CH₂CH3 H Y |||| Same compound =CH₂ Constitutional isomer Stereoisomers. Stereoisomers same compoundОН ОН В For the following molecule B Give the number of stereoisomerism elements :
- 5) relationship between the pairs of structures. NOTE: Each term may be used more than Choose the term from the five terms listed below that BEST describes the once and not all terms need be used. Identical Diastereomers Enantiomers Constitutional isomers Not isomers CH3 CH3 ÇI H3C-Br CH3 Br -CI H,C. D-H H3C- Br H- -D Br CH3 -CI ČH3 OH H3C, CHO OHC, OH OH H. HO CHO OHC CH3 H. OH ÓHIs the following compound R or S. Support your claim by indicating the priority ofthe groups attached to the asymmetric carbon. H,CCH, *CH,OCH, CI4. Two compounds A and B isolated from plants have the following chemical data. Determine the their structures from the data provided (and give the structures of their derivative C) A H2 C 1. Оз C15H28 А, С15Н24 C15H24 Pd/C H 2. NaHSO3 В H2 C H. C15H24 Pd/C C15H28 A HBr Br 1. Оз В, С15Н24 C15H24 2. NaHSO3 В Br HBr C15H24
- 1. Which of the following formulae represent the same compound? (1) CH;CH,CH;CHCH3 (3) CH-CНCH, 1. CH2 (2) CH3 CH3 CHCH;CH2 CH3 CH3 CH;CH3 (4) CH;CHCH,CH,CH3 (5) CH;CH,CHCH;CH3 CH3 CH3 A. (2) and (3) only В. (1), (2) and (4) only С. (1), (4) and (5) only D. (1), (2), (3) and (4) onlyPPh3, DIAD CH20H (A) THF mitsunobu H2N sreaction NH2 excess AGOH () (Ci3H20 INS) me I N-me meFor which compound containing a heteroatom (an atom other than carbon or hydrogen) does the molecular ion have an even-numbered mass? For which does it have an odd-numbered mass? Q.) A bromoalkane with the molecular formula CnH2n11Br
- 2. b) PMBO CH3 Br PMB CH₂-C6H4OCH3 (P) = 1) 'BuLi / MgBr₂ / Ether / -78°C 2) H OCH₂OCH3 CH3 3) acidify (cold) K PMBO CH3 OH OCH₂OCH3 CH3 major diastereomera. Draw and name all of the isomeric products obtainedfrom the monobromination of propane with Br2/light. If halogenation were a completely randomreaction and had an equal probability of occurring atany of the C—H bonds in a molecule, what percentage of each of these monobromo products would beexpected?b. Answer part (a) using 2-methylpropane as the starting material.How are the molecules (i-iv) related to compound X? OH OMe MeO HO. NH2 OH OMe OMe OMe OMe NH2 OH HO, HO. HO NH2 H. NH2 H. OMe MeO ОН HO NH2 MeO MeO ii ii iv (A) i) Constitutional isomer, ii) stereoisomer, iii) identical, iv) stereoisomer (B) i) Stereoisomer, ii) constitutional isomer, iii) identical, iv) stereoisomer (C) i) identical, ii) constitutional isomer, iii) identical, iv) stereoisomer (D) i) stereoisomer, ii) identical, iii) constitutional isomer, iv) identical Select one: a. В b. C С. А d. D