Question

37 a) Draw the Newman and Sawhorse projection of ethane. Which conformation is
more stable? Why?
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Answer 1

Explanation:

(i) Sawhorse projections of ethane

(ii) Newman projections of ethane

Stability of conformation:

(i) There are minimum repulsive forces, minimum energy and maximum stability in the staggered form of ethane. Here, the electrons clouds of carbon-hydrogen bonds are as far as possible.

(ii) the electron clouds come closer when the staggered form changes to the eclipsed form. It results in increased electron cloud repulsions. Here, molecules will have more energy and lesser stability.

Therefore, the staggered form is more stable

Answer 2

Answer:

(i) There are minimum repulsive forces, minimum energy and maximum stability in the staggered form of ethane. Here, the electrons clouds of carbon-hydrogen bonds are as far as possible. Therefore, the staggered form is more stable.