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Chemistry Question on Polarity of bonds

The correct order of increasing polarising power of the cations in the following is AlCl3,MgCl2,NaClAlCl_3,MgCl_2, NaCl

A

AlCl3<MgCl2<NaClAlCl_3 < MgCl_2 < NaCl

B

MgCl2<NaCl<AlCl3MgCl_2 < NaCl < AlCl_3

C

NaCl<MgCl2<AlCl3NaCl < MgCl_2 < AlCl_3

D

NaCl<AlCl3<MgCl2NaCl < AlCl_3 < MgCl_2

Answer

NaCl<MgCl2<AlCl3NaCl < MgCl_2 < AlCl_3

Explanation

Solution

NaCl<MgCl2<AlCl3NaCl < MgCl_2 < AlCl_3 is the correct order of increasing polarising power of the cations. Because according to Fajan?s rules for cations, high charge and small size of the cation have more polarising power that is ability to distort electron density on an cation and induce partial covalent character
Na+<Mg2+<Al3+Na^+ < Mg^{2+} < Al^{3+}