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Basics of Organic Chemistry question

2019 · 10 Apr · Shift 2 · Q5
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Basics of Organic Chemistry question

2019 · 10 Apr · Shift 2 · Q5

JEE MainChemistryBasics of Organic ChemistryMCQ+4 / −1
Which of these factors does not govern the stability of a conformation in acyclic compounds?
  1. A
    Angle strain
  2. B
    Torsional strain
  3. C
    Electrostatic forces of interaction
  4. D
    Steric interactions
View written solutionFree

Correct answer: A

  1. Conformational stability in acyclic compounds depends on interactions that arise due to rotation about single bonds.

  2. In acyclic compounds, the important factors governing stability of different conformations are:

    • Torsional strain: due to eclipsing interactions.
    • Steric interactions: due to crowding between bulky groups.
    • Electrostatic forces of interaction: due to attractive/repulsive interactions between polar groups or charges.

  3. Angle strain arises when bond angles deviate from their ideal values.

    • This is mainly important in cyclic compounds, where ring geometry forces bond angles away from the ideal tetrahedral value.
    • In acyclic compounds, free rotation and flexible bond angles generally prevent significant angle strain from governing conformational stability.

  4. Therefore, the factor that does not govern the stability of a conformation in acyclic compounds is: Angle strain\boxed{\text{Angle strain}}Angle strain​

  5. Option-wise check:

    • A: Angle strain  does not govern acyclic conformational stability.
    • B: Torsional strain  does govern it.
    • C: Electrostatic forces of interaction  do govern it.
    • D: Steric interactions  do govern it.

Hence, the correct answer is A.

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