Question

How many conformations are possible for ethane?

• A. 2
• B. 3
• C. Infinite
• D. One

Hint:

In molecules with single bonds, continuous rotation around the bond leads to an infinite number of conformations. Ethane is a classic example of such a molecule.

Answer 1

The Correct Option is C

Step 1: Understanding Conformations
Conformations refer to the different spatial arrangements of atoms in a molecule that can be interconverted by rotation around single bonds.
Step 2: Analyzing Ethane
Ethane (C\(_2\)H\(_6\)) consists of two carbon atoms connected by a single bond, with each carbon atom bonded to three hydrogen atoms.
The rotation around the C
C single bond leads to different spatial arrangements of the hydrogen atoms.
Step 3: Determining the Number of Conformations
The rotation around the C
C bond is continuous, meaning there are an infinite number of possible conformations as the dihedral angle between the hydrogen atoms changes continuously.
Step 4: Matching with the Options
The correct answer is (C) Infinite, as there are infinitely many conformations due to the continuous rotation around the C
C bond. Final Answer: The number of possible conformations for ethane is (C) Infinite.