JEE Main · 2011 · 10 Apr 2011 · Offline · Chemical Bonding and Molecular Structure

Among the following the maximum covalent character is shown by the compound :

(A) $SnCl_{2}$
(B) $AlCl_{3}$ ✓ Correct
(C) $MgCl_{2}$
(D) $FeCl_{2}$

Answer: (B)

Solution

By Fajans' rules, covalent character grows when the cation is small and highly charged, because such a cation polarises the anion strongly. Among these chlorides the

A l^{3 +}

ion carries the highest charge on the smallest radius, so

AlC l_{3}

polarises chloride the most and shows the greatest covalent character.

JEE Main · 2011 · 10 Apr 2011 · Offline · Single correct option

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