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Q.49.

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Organic Chemistry
Found in: Page 128

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Short Answer

Question: Label the sites of torsional and steric strain in each conformation.

a.

b.

c.

Answer

a.

b.

c.

See the step by step solution

Step by Step Solution

Step 1: Torsional strain

Torsional strain arises due to the great repulsion between two molecules or atoms that do not have a common bonded atom. Therefore, torsional strain arises in the eclipsed conformation.

Step 2: Steric strain

Steric strain occurs due to the overlapping of electron clouds of bulky groups (gauche interaction).

Step 3: Explanation

a.

The molecule has no eclipsed conformation but gauche interaction. Therefore, it has a steric strain, not a torsional strain.

Steric strain sites

b.

The molecule has an eclipsed conformation, not a gauche interaction (heavy groups interaction). Therefore, it only has a torsional strain.

Torsional strain sites

c.

The molecule has an eclipsed conformation and heavy groups interaction. Therefore, it has both torsional and steric strains.

Torsional strain and steric strain site

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