Chemistry · PYQ NEET UG 2019(2)

A compound 'X' upon reaction with \( \mathrm{H_2O} \) produces a colourless gas 'Y' with rotten fish smell. Gas 'Y' is absorbed in a solution of \( \mathrm{CuSO_4} \) to give \( \mathrm{Cu_3P_2} \) as one of the products. Predict the compound 'X'.

1. A
   \( \mathrm{Ca_3(PO_4)_2} \)
2. B
   \( \mathrm{Ca_3P_2} \)
3. C
   \( \mathrm{NH_4Cl} \)
4. D
   \( \mathrm{As_2O_3} \)