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JEE Main levelSingle correct optionDifficulty 2 of 3pt167

Which of the following halides is least likely to exist?

A $PbF X_{4}$
B $PbCl X_{4}$
C $PbI X_{4}$
D $PbO X_{2}$

Answer: C

Pb(IV) is a strong oxidant and iodide is a good reductant, so Pb(IV) would oxidise

I^{-}

to

I X_{2}

and itself drop to Pb(II).

PbI X_{4}

therefore does not exist, while

PbF X_{4}

, the unstable

PbCl X_{4}

and the oxide

PbO X_{2}

are known.

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