Polarizability of halide ions increases in the order:

F^{-} < I^{-} < B r^{-} < C l^{-}

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C l^{-} < B r^{-} < I^{-} < F^{-}

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I^{-} < B r^{-} < C l^{-} < F^{-}

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F^{-} < C l^{-} < B r^{-} < I^{-}

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Solution

The correct option is D $F^{-} < C l^{-} < B r^{-} < I^{-}$
Polarisability of halide ions increases in the order $F^{-} < C l^{-} < B r^{-} < I^{-}$ . Polarisability is directly proportional to the size of the anion. Larger is the size of the anion, larger is the polarizability and vice versa. Thus, iodide ion has the maximum size, and hence the maximum polarisability.

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