The compound (s) which generate (s) `N_(2)` upon thermal decomposation is (are) :

The metal oxide (s) which decompose on heating is (are)

The compound which undergoes S_(N^(1)) reaction most rapidly is :

Thermal decomposition product(s) of XeF_(2) are:

In the the given pair of compound , in which pair the second compound is more reaction than first toward S_(N^(2)) reaction ?