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Conformational Analysis, Stereo-isomerism

Conformational Analysis, Stereo-isomerism

Study the different arrangements of atoms resulting from rotation about a single bond. Learn the three types of conformational representations: sawhorse representations, Fischer projections, and Newman projections. Understand conformations of Ethane.

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Conformational Analysis, Stereo-isomerism

Quiz • 20 Questions

Conformational Analysis, Stereo-isomerism - Flashcards

Flashcards • 19 Cards

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7 min • Summary

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List of Questions20 questions
  1. Question 1
    • A conformational isomer is a specific type of conformer.
    • Conformers and conformational isomers are identical terms, used interchangeably.
    • A conformer is a specific type of conformational isomer.
    • Conformers are molecules with different connectivity, while conformational isomers have the same connectivity.
  2. Question 2
    • The spatial relationship between atoms.
    • The respective sizes of atoms/groups.
    • The positioning of all molecules.
    • The atoms relative positions in space.
  3. Question 3
    • Differences in the connectivity of atoms.
    • Differences in spatial arrangements due to rotation about single bonds.
    • Differences in reactivity resulting from bond dissociation.
    • Differences in types of atoms present.
  4. Question 4
    • Eclipsed and staggered conformations have the same energy, with no difference in stability.
    • Eclipsed conformations have lower energy and are more stable than staggered conformations.
    • Eclipsed conformations have higher energy and are less stable than staggered conformations.
    • Eclipsed conformations are only relevant at low temperatures; staggered ones are higher at high temperatures.
  5. Question 5
    • Torsional strain.
    • Differences in electronegativity.
    • Differences in bond lengths.
    • Variations in bond angles.
  6. Question 6
    • Propane has fewer carbon-hydrogen bonds.
    • Propane contains a sterically more bulky methyl group.
    • Ethane has a sterically more bulky methyl group.
    • Ethane has more torsional strain than propane.
  7. Question 7
    • Anti-conformer because it maximizes the distance between the methyl groups.
    • Syn-conformer because it minimizes torsional strain.
    • Eclipsed conformer because it lowers torsional strain.
    • Gauche conformer because it reduces steric hindrance.
  8. Question 8
    • Hydrogen bonding between methyl groups.
    • Minimal steric strain.
    • Torsional and steric strain.
    • Minimal torsional strain.
  9. Question 9
    • The strain arising when bond angles deviate from the ideal tetrahedral angle.
    • The strain resulting from eclipsing hydrogens.
    • The strain arising from twisting of the molecule.
    • The strain resulting from steric interactions.
  10. Question 10
    • It has bent bonds and incomplete overlapping of orbitals.
    • The bonds are stronger than normal alkanes.
    • It is non-planar.
    • It has less angle strain.
  11. Question 11
    • Cyclobutane has less angle strain and more torsional strain than cyclopropane.
    • Cyclobutane has more angle strain and less torsional strain than cyclopropane.
    • Cyclobutane is planar while cyclopropane is non-planar.
    • Cyclobutane and cyclopropane have similar angle and torsional strain.
  12. Question 12
    • To maximize angle strain.
    • To increase torsional strain.
    • To minimize torsional strain.
    • To avoid steric interactions.
  13. Question 13
    • The chair conformation has minimal torsional strain.
    • The chair conformation has more torsional strain.
    • The chair conformation has more angle strain.
    • The chair conformation is planar.
  14. Question 14
    • Perpendicular to the ring axis.
    • Parallel to the ring equator.
    • Perpendicular to the ring plane.
    • Parallel to the ring axis.
  15. Question 15
    • The axial substituent experiences less steric strain.
    • The equatorial substituent experiences less steric strain.
    • The equatorial substituent experiences greater steric strain.
    • The axial substituent is always smaller in size.
  16. Question 16
    • $7.6 \text{ kJ/mol}$
    • $11.4 \text{ kJ/mol}$
    • $3.8 \text{ kJ/mol}$
    • $5.0 \text{ kJ/mol}$
  17. Question 17
    • The conformer with the most 1,3-diaxial interactions.
    • The conformer with both substituents axial.
    • The conformer with both substituents equatorial.
    • The conformer where the largest substituent is axial.
  18. Question 18
    • In a _cis_-isomer, substituents are on the same side; in a _trans_-isomer, they are on opposite sides.
    • _Cis_ and _trans_ indicate the presence of a ring flip.
    • _Cis_ and _trans_ refer to the size of the substituents.
    • In a _cis_-isomer, substituents are on opposite sides; in a _trans_-isomer, they are on the same side.
  19. Question 19
    • Torsional strain.
    • Angle strain.
    • Bond strain.
    • Steric strain.
  20. Question 20
    • The isopropyl group rotates away.
    • The _tert_-butyl group smaller.
    • The _tert_-butyl group positioned above the ring causes more space competition.
    • The isopropyl group is bulkier.
List of Flashcards19 flashcards
  1. Card 1
    HintThink about how molecules can turn around a central axis.Memory TipRotational arrangements
  2. Card 2
    HintIt's a specific 'snapshot' of a molecule's shape.Memory TipSpecific molecular shape
  3. Card 3
    HintThink about drawing a molecule in 2D to show its 3D parts.Memory Tip2D view of 3D molecule
  4. Card 4
    HintImagine looking at a molecule from an angle, like a horse on sawhorses.Memory TipAngled molecular view
  5. Card 5
    HintThink of looking directly down a bond, seeing one atom in front of another.Memory TipEnd-on molecular view
  6. Card 6
    HintImagine laying a molecule flat to see the arrangement of its groups.Memory TipFlat stereochemical view
  7. Card 7
    HintImagine atoms directly overlapping when viewed end-on.Memory TipOverlapping bonds, high energy
  8. Card 8
    HintImagine atoms positioned between each other, maximizing distance.Memory TipSpaced out bonds, low energy
  9. Card 9
    HintThink of the 'twist' or resistance to rotation around a bond.Memory TipStrain from bond rotation
  10. Card 10
    HintThink of the stress on a bond when it's forced into an unnatural angle, like in small rings.Memory TipBent bond angles
  11. Card 11
    HintConsider the three main types of 'stress' a cyclic molecule can experience.Memory TipSTA: steric, torsional, angle
  12. Card 12
    HintIt's the smallest cyclic alkane, forced into an equilateral triangle shape.Memory TipTriangle, high angle strain
  13. Card 13
    HintIt's a four-membered ring, slightly out of plane to reduce strain.Memory TipSquare, bent, torsional strain
  14. Card 14
    HintThink of it as twisting to escape being flat.Memory TipPuckered, avoids flatness
  15. Card 15
    HintImagine sitting in a comfortable chair, it's the most relaxed and stable shape for cyclohexane.Memory TipMost stable, like a chair
  16. Card 16
    HintImagine a boat shape, where the 'bow' and 'stern' atoms are pointing up, leading to interactions.Memory TipUnstable, boat shape
  17. Card 17
    HintThink of hydrogens sticking straight up or straight down from the ring.Memory TipUp/down, perpendicular
  18. Card 18
    HintThink of hydrogens spreading out around the 'equator' of the ring.Memory TipAround the 'equator'
  19. Card 19
    HintConsider the space available for a substituent in each position.Memory TipEquatorial is stable

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