Q88 / 240 · KCET 2026 · Chemistry
Statement I: Staggered conformation of ethane is more stable than the eclipsed conformation.
Statement II: The torsional strain in staggered conformation is more.
Read the above statements and choose the correct answer from the options given below.
Statement II: The torsional strain in staggered conformation is more.
Read the above statements and choose the correct answer from the options given below.
- ABoth Statement I and Statement II are false
- BBoth Statement I and Statement II are true
- Correct answerCStatement I is true but Statement II is false
- DStatement I is false but Statement II is true
Solution
Statement I is true because in the staggered conformation of ethane, the electron clouds of the C-H bonds on adjacent carbon atoms are as far apart as possible. This minimizes the repulsive forces between them, making the staggered conformation more stable than the eclipsed conformation.
Statement II is false because torsional strain arises from the repulsive interaction between the electron clouds of adjacent bonds. In the staggered conformation, this repulsion is at a minimum, so the torsional strain is minimum, not more. It is maximum in the eclipsed conformation.
Therefore, Statement I is true but Statement II is false.
Answer: Statement I is true but Statement II is false
Statement II is false because torsional strain arises from the repulsive interaction between the electron clouds of adjacent bonds. In the staggered conformation, this repulsion is at a minimum, so the torsional strain is minimum, not more. It is maximum in the eclipsed conformation.
Therefore, Statement I is true but Statement II is false.
Answer: Statement I is true but Statement II is false
Hence, the correct answer is option: 'C'.