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JEE Main · 2019 · 10 Apr 2019 · Shift 2 · General Organic Chemistry

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Which of these factors does not govern the stability of a conformation in acyclic compounds?
  1. (A)Torsional strain
  2. (B)Angle strain✓ Correct
  3. (C)Steric interactions
  4. (D)Electrostatic forces of interaction

Answer: (B)

Solution

In an open-chain molecule the carbon skeleton is free to settle at its natural tetrahedral angles, so bending of the bond angles simply does not arise as the molecule rotates about its single bonds. What does decide which conformation is favoured is the torsional strain of eclipsing bonds, the steric clash of bulky groups brushing past one another, and the electrostatic push and pull between polar parts. Angle strain belongs to strained rings, so it is the factor that plays no role here.

JEE Main · 2019 · 10 Apr 2019 · Shift 2 · Single correct option

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