White phosphorus is more reactive than N₂ because

White phosphorus is more reactive than nitrogen as nitrogen gas is very stable. It forms triple bond and has very high dissociation energy which requires large amount of energy to break. Also, Nitrogen is involved in the pπ-pπ side were overlaps small size which further makes it very strong. This type of bonding is not exhibited by Phosphorus. Thus, the correct option is (c)