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Assertion : Sigma ( $\sigma$ is a strong bond, while pi $(\pi)$ is a weak bond.
Reason : Atoms rotate freely about pi ( $\pi$ ) bond.
Options:
Reason : Atoms rotate freely about pi ( $\pi$ ) bond.
Solution:
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Verified Answer
The correct answer is:
If the assertion is true but the reason is false.
Sigma bonding involves end to end overlapping of the two atomic orbitals e.g. between $s$ and $s, s$ and $p$ and $p$ and $p$ orbitals.
Pi bonding $(\pi)$ involves sidewise overlapping of the two atomic orbitals e.g. between $p$ and $p$ orbitals.
Overlapping of orbitals is more effective in $\sigma$ bonding than in $\pi$-bonding. Due to the geometry of overlapping or orbitals, rotation of one atom is not
possible around $\pi$-bonds.
Pi bonding $(\pi)$ involves sidewise overlapping of the two atomic orbitals e.g. between $p$ and $p$ orbitals.
Overlapping of orbitals is more effective in $\sigma$ bonding than in $\pi$-bonding. Due to the geometry of overlapping or orbitals, rotation of one atom is not
possible around $\pi$-bonds.
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