Assertion : Sigma ( ) is a strong bond, while pi ( ) is a weak bo… - Vidyadip

MCQ

Assertion : Sigma $(\sigma )$ is a strong bond, while pi $(\pi )$ is a weak bond.
Reason : Atoms rotate freely about pi $(\pi )$ 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.
✓
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

✓

Answer

Correct option: C.

If the Assertion is correct but Reason is incorrect.

c
Sigma $(\sigma )$ bond is formed by axial overlap of atomic orbitals while pi $(\pi )$ bond is formed by lateral overlap. Since axial overlapping takes place to a greater extent than the lateral overlapping, former $(\sigma )$ bond is stronger than pi bond. Atoms attached to doubly bonded atom can't rotate freely around the double bond.

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