Which element from the following belongs to the oxygen family?

White phosphorus reacts with sulphuryl chloride to form $PCl_5$ and $X$. Chlorine reacts with $X$ in the presence of wood charcoal to form $Y$. $X$ and $Y$ are respectively

The highest catenation ability is shown by

Peroxo acids of sulphur are:

Oxygen does not react directly with which of the following?

Which of the following compounds has the maximum number of oxo groups $(M=O)$?