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# Among the following molecules,which is the most ionic?

$\begin{array}{1 1}(a)\;CuCl& (b)\;SnCl_2 \\(c)\;NaCl&(d)\;CaCl_2\end{array}$

Greater the electronegativity difference between two atoms,higher the ionic character of the bond.The difference in electronegativity between Na and Cl atoms is the greatest.
Hence (c) is the correct answer.