Q3 · CSIR-NET Chemistry, June 2012
Paper: CSIR-NET June 2012 · Subject: Inorganic Chemistry · Chapter: Chemical Bonding · Topic: Hydrogen Bonding Weak Interactions · Marks: 2 · Difficulty: Medium
The strength of $\mathrm{P}\pi$-$\mathrm{d}\pi$ bonding in E-O (E = Si, P, S and Cl) follows the order
(a)$\mathrm{Si}-\mathrm{O}>\mathrm{P}-\mathrm{O}>\mathrm{S}-\mathrm{O}>\mathrm{Cl}-\mathrm{O}$
(b)$\mathrm{P}-\mathrm{O}>\mathrm{Si}-\mathrm{O}>\mathrm{S}-\mathrm{O}>\mathrm{Cl}-\mathrm{O}$
(c)$\mathrm{S-O>Cl-O>P-O>Si-O}$
(d)$\mathrm{Cl-O>S-O>P-O>Si-O}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Contracted, lower-energy 3d orbitals overlap better with O 2p, so pπ–dπ bonding strengthens Si–O < P–O < S–O < Cl–O (d).
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