Question

Consider the following conformations: 

Statement-I: I$^{nd}$ is more stable than I$^{st}$. 
Statement-II: As dihedral angle increases, stability decreases. 
 

• A. Statement-I is incorrect but Statement-II is correct
• B. Statement-I is correct but Statement-II is incorrect
• C. Both statements are correct
• D. Both statements are incorrect

Hint:

Greater dihedral angle between bonds reduces torsional strain and increases stability.

Answer 1

The Correct Option is B

Statement-I Analysis:
The II$^{nd}$ conformation is more stable because it has less steric strain and reduced torsional strain compared to the I$^{st}$ conformation. Hence, Statement-I is correct.
Statement-II Analysis:
As dihedral angle increases, torsional strain decreases and stability increases. Therefore, Statement-II is incorrect.