Use the table below to name the compound.

$\backslash$table$[[$Formula$,$Name,Formula,Name$],[S{O}_2,$sulfur dioxide,$C{l}_2{O}_7,$dichlorine heptoxide$],[S{O}_3,$sulfur trioxide,$C{S}_2,$carbon disulfide$],[N_2{O}_4,$dinitrogen tetroxide,$SC{l}_4,$sulfur tetrachloride$],[A{s}_4{O}_6,$tetraarsenic hexoxide,$Se{F}_6,$selenium hexafluoride$]]$

a$.PC{l}_3$

b$.S{F}_6$

c$.N{O}_2$

d$.$ IF