Which of the following molecules is the most | vedclass

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(C) According to Fajan's rule,the covalent character of an ionic bond increases with the polarising power of the cation.Polarising power is directly p

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$HgCl_2$

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(C) According to Fajan's rule,the covalent character of an ionic bond increases with the polarising power of the cation.Polarising power is directly proportional to the charge density of the cation,which is determined by its size and charge.Among the given cations ($Zn^{2+}$,$Cd^{2+}$,$Hg^{2+}$,$Cu^+$),the $Hg^{2+}$ ion has the highest polarising power due to its large size and the presence of a pseudo-noble gas configuration ($18$ electrons in the outermost shell),which is more effective at distorting the electron cloud of the $Cl^-$ anion.Therefore,$HgCl_2$ exhibits the most covalent character.

Which of the following molecules is the most covalent?

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