Order of covalent bond — which of the following are correct?

A. KF KI; LiF KF
B. KF

Question

Order of covalent bond — which of the following are correct?

A. KF  KI; LiF  KF
B. KF < KI; LiF  KF
C. ; CuCl  NaCl
D. LiF  KF; CuCl  NaCl
E. KF < KI; CuCl  NaCl

Canvas Classes · Accepted Answer

Covalent character increases with Fajans' rules: smaller cation, higher charge, pseudo-noble gas config, larger/more polarisable anion.

Step 1 — Evaluate each statement:

A. KF  KI: Larger anion (I⁻) is more polarisable → KI is MORE covalent than KF → Incorrect ✗

B. KF < KI: KI is more covalent (I⁻ more polarisable) ✓; LiF  KF: Li⁺ is smaller → more polarising → LiF more covalent ✓ → Correct ✓

C. : Sn⁴⁺ has higher charge → more polarising → more covalent ✓; CuCl  NaCl: Cu⁺ has 18-electron con

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