Sodium borohydride upon treatment with iodine produces a Lewis acid $(X)$,which on heating with ammonia produces a cyclic compound $(Y)$ and a colourless gas $(Z)$. $X, Y$ and $Z$ are $....$
- A$X= BH_3; Y= BH_3 \cdot NH_3; Z= N_2$
- B$X= B_2H_6; Y= B_3N_3H_6; Z= H_2$
- C$X= B_2H_6; Y= B_6H_6; Z= H_2$
- D$X= B_2H_6; Y= B_3N_3H_6; Z= N_2$
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