Question

Assertion :$p\pi -p\pi$ bonding is much more significant than the $p\pi -d\pi$ bonding. Reason: In $P\pi -P\pi$ bonding, the overlapping lobes are parallel, and as a result there occurs a pure sideways $(\sim at{180}^{\circ })$ overlap; on the other hand, in $p\pi -d\pi$ bonding the lobes of the overlapping d - orbitals are at an angle < ${180}^{\circ }$ to the lobes of the p-orbital.

Read the above assertion and reason and choose the correct option regarding it.

• A. Assertion is true, Reason is true and Reason is correct explanation for Assertion
• B. Assertion is true, Reason is true and Reason is not the correct explanation for Assertion
• C. Assertion is true, Reason is false
• D. Assertion is false, Reason is true

Answer 1

The correct option is D

Assertion is false, Reason is true

In $P\pi -P\pi$ bonding, the overlapping lobes are parallel, and as a result there occurs a pure sideways $(\sim at{180}^{\circ })$ overlap; on the other hand, in $p\pi -d\pi$ bonding the lobes of the overlapping d - orbitals are at an angle < ${180}^{\circ }$ to the lobes of the p-orbital.
Hence, $p\pi -p\pi$ bonding is less significant than the $p\pi -d\pi$ bonding.
Hence, assertion is false, reason is true.