The intermediate X, in the reaction :

In the following reaction :

The compounds A and B respectively are :

The reaction of with bromine and KOH gives RNH₂ as the end product. Which one of the following is the intermediate product formed in this reation?

The number of N atoms in 681 g of C₇H₅N₃O₆ is x $$\times$$ 10²¹. The value of x is (N_A = 6.02 $$\times$$ 10²³ mol^$$-$$1) (Nearest Integer)