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  4. Which of the following has lowest boiling point?

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Q. Which of the following has lowest boiling point?

Punjab PMETPunjab PMET 2008Chemical Bonding and Molecular Structure

Solution:

According to Fajan's rule, as the size of cation decrease, its polarising power increases. Hence, $Cu ^{2+}$ polarise Cl $^{-}$ions more than $Cu ^{+}$, Therefore, $CuCl _{2}$ has more covalent character and hence, its boiling point is less.