Which one of $P C l_{4}^{+}$ and $P C l_{4}^{-}$ is not likely to exist and why?

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Solution

When phosphorous accepts 3 electrons from 3 chlorine atoms it completes its octet, so it is unable to take one more electron from one more $C l^{-}$ so the fomation of $P C l_{4}^{-}$ is difficult.

As we move down the group, the stability of +5 oxidation state decreases and the stability of +3 oxidation state increases. Chlorine belongs to third period. Hence, $P C l_{4}^{+}$ compound is more likely to exist.

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