Question:

At room temperature, the eclipsed and staggered forms of ethane cannot be isolated because

Updated On: Jul 2, 2022
  • they interconvert rapidly
  • both the conformers are equally stable
  • the energy difference between the conformers is large
  • there is a large energy barrier of rotation about the $ \sigma $ bond
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The Correct Option is A

Solution and Explanation

Since, the energy difference between two conformations of ethane is not so large, so the eclipsed and staggered conformations interconvert rapidly. Thus, it is impossible to isolate these forms at room temperature.
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Concepts Used:

Hydrocarbons

Hydrocarbons can be described as organic compounds that consists only hydrogen and carbon atoms. These compounds are of different types and thereby have distinct natures. Hydrocarbons are colorless gases and are known for discharging faint odours. These have been categorized under four major classes named as alkynes, alkanes, alkenes, and aromatic hydrocarbons. 

Types of Hydrocarbons

  1. Saturated hydrocarbons - Saturated hydrocarbons are those compounds where there is a single bond exists between carbon atoms and are saturated with atoms of hydrogen.
  2. Unsaturated hydrocarbons - Hydrocarbons comprises of at least one double or triple bond between carbon atoms are known as unsaturated hydrocarbons.
  3. Aliphatic hydrocarbons - The term denotes the hydrocarbons formed as an outcome of the chemical degradation of fats. Aliphatic hydrocarbons are basically chemical compounds.
  4. Aromatic hydrocarbons - They are distinguished because of the presence of benzene rings in them. They give away distinct types of aroma. These hydrocarbons comprises of only hydrogen and carbon atoms.