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- 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.compound CH3 CH₂0 CH3 — OH C- CH3 1 CH3-N - CH3 CH₂ ||| -C-H 01C- | NH₂ CH3 family esterFor each solute, click the button under the better solvent. solute Which is the better solvent? (CH,CH,),N :0: :0: NH — С — Nн, CH,-C CH, CH;OH CaCl2 CCI4 CH,OH NaCl I Don't Know Submit
- 4. The scheme below shows the reaction of a ketone, 2-propanone with methanol. ОН :0 : || CH;-C-CH3 : ОН + H - Н CH,-C-CH3 CH;-C-CH3 N step 1 step 2 step 3 P CH;OH CH3 CH;OH step 4 OCH, CH,-C-CH3 H - H,0 R CH;-C-CH3 step 7 step 6 step 5 OCH3 OCH; i) Write the missing structures (N, O, Q and R) in the above reaction scheme. ii) Name the class of compounds P and S belong to? iii) This is an acid catalyzed reaction. What does this statement mean? iv) Draw the arrow diagram in step 6 to show how intermediate R is formed? Write the equation for this step ONLY. v) Steps 3 and 7 involve loss of a proton from the intermediate ions. Why is this step necessary?Classify the following pair of compounds. Select the single best answer. HO ||||... CH3 The compounds are: stereoisomers constitutional isomers O different molecules identical molecules ||||| CH3 X S OH 00 olo ArExample: H R 11' COO- Ca ↓ NH3 L or D?
- Page of 11 ZOOM + A1. What is the arrangement of the bonds surrounding carbon in a saturated hydrocarbon? linear trigonal planar tetrahedral В trigonal bipyramidal A2. What is the definition of a constitutional isomer? A molecules with the same numbers and kinds of atoms arranged in different ways molecules with the same arrangements of atoms, but different arrangements of electrons molecules with the same connectivities, but different 3-D angles molecules with different isotopes of the same atoms В АЗ. How many hydrogen atoms does the following molecule contain? 12 В 16 18 Which functional group gives rise to a broad IR absorption between 3200 cm-1 and 3600 cm-1? A4. A O-H stretch C-H stretch O-H bend C-O stretch А5. How many resonances will appear in the 13C NMR spectrum of cyclopentanone? 3 4 Section A continues on the next page N468 ABCD ABCD ABCDH2CrO4 Но HO.h) i) + CH3CHSSCHCH3 CH3 CH3 Cl₂ [H] FeCl3 ? ?