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- Which structure (or structures) represents (or represent) the enantiomer of the molecule below? I OCH 3 &&&* IV I III and IV ||| || OCH3 OH OCH 3 & II || Br III OCH3 H3CO/I IVDraw a dash-wedge structure for (1R)-1-bromo-1,3,3-trimethylcyclohexane.How many degrees of unsaturation (double bond equivalents) does C4H10ClNO have?
- Rank the conformers of 1,2,4-trimethylcyclohexane in order of decreasing stability, putting the most stable first. II II IV Multiple Choice III > || > IV > | III > IV > || > | |> || > IV > II| |> || > I| > IVH CH, is molecule chiral or achiral? CH, H.Which of the following is the highest energy chair conformer of the most stable isomer of 1-ethyl-2,4-dimethylcyclohexane? A | B II C) III IV = || ||| > IN
- H₂N S=0 atom 1 CH3 ; atom 2 isoxazole ring Assuming the heterocyclic ring above to be planar: Give the number of electrons that are contributed to the pi system of the heterocyclic ring by: bextra, a COX-2 inhibitor, used in the treatment of arthritis ✓; atom 3 NA . Enter NA for atom 3 if the structure above has only two numbered atoms. How many electrons are in the pi system of the heterocyclic ring? (In the case of fused rings add all the pi electrons.) Is the heterocyclic ring with the numbered atoms aromatic?[• -- H (b) H,C 3-methylhexane CH, (c) B கூ CH, CH, HgCG; சீகூ H₂CH H 3-ethyl-1-methyloctane 3,3 diethyl pentane 5Å, Å,CH, W CH3 CH2 CH₂ W21 Su2... CH3 X -CH3 G b F E L cWhich of the following is the correct Newman projection for the following compound as viewed down the indicat conformation shown? CO II O III O IV OV CH3 CH3 CH31 CH3 CI || Br Br H CH3 CH3 ||| Br CH3 CH3 IV CI Br CH3
- CH3Li CH3MgBr (CH3)2CuLi CH3OH4.(a). Draw the structures of (i) cis-1,4-Dibromocyclohexane and (ii) trans-1,4- Dibromocyclohexane. 4(b). Draw the most stable conformers of (i) cis-1,4-Dibromocyclohexane and (ii) trans-1,4-Dibromocyclohexane. 4(c)Which is more stable? (i) cis-1,4-Dibromocyclohexane or (ii) trans-1,4- Dibromolcyclohexane. Explain the reason for your choice.Classify the pairs of molecules as not the same molecule, structural isomers, diastereomers, enantiomers or identical. Circle any molecules that are not achiral (a) (b) (c) Br... H CI H H Br H H3C Br H. CI Br H Br CI I I Br" "H H Br H CH3 Cr Br