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# Which of the following compounds does not obey the octet rule?

$\begin{array}{1 1}(a)\; PF_5\\(b)\; SF_6\\(c)\; H_2SO_4\\(d)\;All\; of\; the \;above\end{array}$

All the three compounds does not contain 8 electrons in the valence shell
Hence (d) is the correct answer.