Question

The fully eclipsed conformation of n-butane is least stable due to the presence of?

• A. Bond opposition strain only
• B. steric strain only
• C. Bond opposition strain as well as steric strain
• D. no strain is present in the molecule

Answer 1

Answer: (B)

steric strain only

Fully eclipsed form of $n$-butane has $2$ methyl groups at the back of each other, making it least stable due to steric strain.

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