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Draw a structural formula for the most stable carbocation with each molecular formula.
Q.) C4H9+
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- Draw a structural formula for the most stable carbocation with each molecular formula. Q.) C3H7O+4. 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. H3CH,C -CH3 H,C -CH3 CH3 H,C CH structure 1 structure 2 Which is the more stable alkene? Explain your answer.
- 6) Draw the energetically favored (more stable) chair conformer of the following cyclohexane. H3C OH 110How many isomers (structural, geometric, and stereo) have the formula C5H₁0, and have "cyclo" in their name? (i.e. they contain a ring) 6 4 7 3 5Considering rotation around the indicated bond in each compound, draw Newman projections for the most stable and least stable conformations. a. CH3-CH2CH2CH2CH3 b. CH;CH,CH2-CH,CH2CH3
- 4. Draw the most and least stable conformations of the following substituted cyclohexanes in the chair format (excluding transient conformations like half chair, twist boat and boat). Br BL Br Br7. Which one of the following conformations of disubstituted cyclohexanes is expected to be the most stable? H,C CH, - CH3 A) B) CH3 CH3 CH, D) CH, CH, OB ODWhich alkene below has the most stable carbon-carbon double bond? A B C D B 0 D A
- CH3CH2CH2 H CH3CH2CH2 CH3 H2C=CHCH,CH2CH2CH3 CH3 B Which of the alkenes above is the least stable (highest in energy)? Which is the most stable (lowest in energy)?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.Which alkenes exist as pairs of cis,trans isomers? For each that does, draw the trans isomer. Q.) (CH3)2C=CHCH3