Question

Assertion: $\sigma$ is strong while $\pi$ is a weak bond.

Reason : Atoms rotate freely about $\pi$ bond.

• A. Both assertion and reason are true, and reason is not the true
  explanation of the assertion.
• B. Both assertion and reason are true, but reason is the true
  explanation of the assertion.
• C. Assertion is true, but reason is false
• D. Both assertion and reason are false.

Answer 1

Answer: (C)

Assertion is true, but reason is false

$\sigma$ bond is stronger than $\pi$ bond because in $\sigma$ bond the overlap is axial while in $\pi$ bond. It is lateral.

Due to the lateral overlap in $\pi$ bond atoms cannot rotate freely in $\pi$ bond.
So, assertion is true and reason is false.