Assertion: Sigma (σ) is a strong bond, while pi (π) is a weak bond.
Reason: Atoms rotate freely about pi (π) bond.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(e) If the Assertion is incorrect but the Reason is correct.
(c) If the Assertion is correct but Reason is incorrect.
Explanation:
Sigma (σ) bond is formed by axial overlap of atomic orbitals while pi (π) bond is formed by lateral overlap. Since axial overlapping takes place to a greater extent than the lateral overlapping, former (σ) bond is stronger than pi bond. Atoms attached to doubly bonded atom can't rotate freely around the double bond.