Question

1. How does one enantiomer become another?

2. What does the energy of the conformations of a molecule depend on?

3. When the C2-C3 bond is rotated in the anti butane conformation how many eclipsed interactions are observed?

4. What happens in the folded conformation of cyclobutane compared to the flat?

5. How is the interconversion of cyclohexane chairs achieved?

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Answer 1

Ans:

1) just by c-c single bond rotation or by flipping we get another enantiomer

2) Energy of an confirmations depends on arrangements of group of adjacent carbon atom and also depends on substituents present on carbon atom. if less interaction is present then conformation becomes more stable and vice versa.

3) three eclipsing interaction are observed due to four hydrogen and two methyl groups contribute 5.3 kcal/ mol energy

4) folded confirmation of cyclobutane i.e puckered confirmation . on going from flat confirmation to folded confirmation angle strain increases but tortional or eclipsing strain decrease of eclipsing hydrogen .

5) just by ring flipping or chair flipping interconversion of cyclohexane achieved.