Why can't the 1-methylbutane isomer exist? 1.Why is this conformation highly unstable at room temperature? 2.Why does this molecule react violently with water? 3.because this molecule is not an isomer of butane, it is another alkane. 4. All of the above
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- 4. a) Calculate the units of unsaturation for the formula C6H10O2. b) Draw a structure of C6H1002 that has no formal charges and a) ester and ring b) carboxylic acid lotfasss.com 5. A student tried to draw the most stable conformation of the molecule shown below. What is wrong with the Newman projection that they drew? view OCH 3 H H H 6. A student tried to draw one of the chair conformations of the molecule shown below. What is wrong with the chair that they drew? H3C Student answer for most stable Newman Projection H3C. CH3 H OH TH H H H UU .H OCH 3 has: c) ketone and alcohol H 7. Which type(s) of strain are present in the following molecules? (steric, torsional, angle, etc) H H O H H H H H Hball & stick v + labels Which of the Newman structures below represents this conformation of 3-chloro-2-methylpentane, as viewed along the C2-C3 bond? ***** CH3 Et H Et Et. .CI H3C. CH3 Et. H3C. H3C H. TCI H3C CH3 H. ČH3 H ČH3 a b d (Enter the letter(s) of the correct structure(s), in alphabetical order and without punctuation; more than one answer may be correct. Et = an ethyl group)1 F1 Q @ 2 F2 W Draw the two chair cyclohexane conformations for the compound shown below. How many substituents are axial in the less stable conformation? >> F10 #3 3 C/ "CI 00 01 02 03 A Moving to another question will save this response. 80 F3 F4 ㅎ... E S4 $ R % 5 F5 T MacBook Air F6 6 Y & 7 F7 U * 00 8 DII F8 ( 9 F9 ) 0 1 I P
- on 5 of 27 Ⓒ Macmillan Learning > Parano Draw the structure of an alkane or cycloalkane that has more than three but fewer than ten carbon atoms, and only primary hydrogens. (There are several possible structures. It is enough to draw any one of them, but you may draw two or more if you want to.) Draw the unknown structure(s). / Select |||||| III G C Draw H Rings MacBook Pro More Erase Q2 QQ5-A- Define Covalent bond with example? B- Choose the correct answer (4 only): 1-The molecular formula of ethane is: A.CH4 В. С2Н6 С. СзНя D.C4H10 2- Which of the following is not an alkene? A. Propane B. Butene С. C:H12 D. C4H10 3-As compared to its parent alkane, an alkyl radical contains one A. less carbon B. less hydrogen C. more carbon D. more hydrogen 4- Almost 95% of compounds are of carbon because they can form A.single bonds B. double bonds C.Triple bonds D.Multiple bond 5- The general formula for alkynes is : A. CnH2n-2 B. CnH2n C. CnH2n-2 D. nH2n-14. Which structure below represents the most stable conformation of cis-1-t-butyl-4-methylcyclohexane? A B D 5. The planar form of which ring would have bond angles close to the tetrahedral value, but is destabilized by eclipsing interactions (torsional strain)? Which of the following statements about conformations is FALSE? A) Conformations can be isolated and separated at room temperature B) Conformations are interconverted by rotation about o-bonds C) For butane the staggered anti conformation is the most stable D) For ethane the eclipsed conformation is the least stable 6. 7. Which of the following compounds has two chirality centers? .H H. H3C
- Sight along the C2-Cl bond of 2-methylpropane (isobutane). a. Draw a Newman projection of the most stable conformation. b. Draw a Newman projection of the least stable conformation. c. Make a graph of energy versus angle of rotation around the C2-Cl bond. d. Assign relative values to the maxima and minima in your graph, given that an H↔H eclipsing interaction costs 0 kJ/mol and an H↔CH3 eclipsing interaction costs 6.0 kJ/mol.Consider pentane, C5H12. Looking through the internal C3-C4single bond, draw thesix Newman projections (where the angle between two bonds as you look through the C3and C4bond is either 0°or 60°of the different conformations. Label the conformers/rotamers using I, II, etc. a.Which conformer is the most stable? the least stable? b.Which rotamer is the anticonformer? the gaucheconformer? c.Draw the anticonformer in saw horse projection.Analyze the two Newman projections and determine the relationship between the two. How would you describe the relation between conformations when they are maintained at a temperature too low to permit them to interconvert? CH3 CH3 Br. H H H H A. Identify the relationship. They are identical. They are structural isomers. They are stereoisomers. They are conformers. H H -I H Br H B. What is the relationship at low temperatures? They are identical. They are conformational diastereomers. They are structural isomers. They are conformational enantiomers.
- Chemistry Alkanes: Order the stereoisomers in order of energy in their lowest energy conformations Part A The following three compounds can be made by a reaction developed in the Grossman group. Rank them from lowest to highest energy in their lowest energy o Rank from lowest to highest. To rank items as equivalent, overlap them. Reset Help CO₂Me CO₂Me CO₂Me ICNO CNO ww Submit CN CO Me CH₂ lowest energy The correct ranking cannot be determined. My Answers Give Up CN CO Me CH₂ CN O CN CO Me CH₂ highest energyAll of the following conformational models are representative of 2,3-dimethylpentane. Which of these models corresponds to its S isomer? Et OA H. Me Me H. Me OB. Me H. Et Me H. Мe OC. iPr H Me Me H. H OD. Me H H H -iPr Me MacBook PrO esc #3 24 % & 3 7 8 Q W E R ecoO II III O IV OV What is the structure of (1S,2R)-1-ethyl-2-methyl-1,2-epoxycyclohexane? .... www IV го II шо V III