1.

A translucent white waxy solid (A) reacts with excess of chlorine to give a yellowish white powder (B). (B) reacts with organic compounds containing -OH group converting them into chloro derivatives. (B) on hydrolysis gives (C) and is finally converted to phosphoric acid. (A), (B) and (C) are

Answer»

`P_4, PCl_5 , H_3PO_4`
`P_4,PCl_5 , H_3PO_3`
`P_4, PCl_5, POCl_3`
`P_4, PCl_3 , POCl_3`

Solution :`UNDERSET"(A)"(P_)4 + 10Cl_2 to underset"(B)"(4PCl_5)`
`PCl_5 + C_2H_5OH to C_2H_5Cl + POCl_3 + HCl`
`PCl_5 + H_2O to underset"(C )"POCl_3 + 2HCL`
`POCl_3 + 3H_2O to H_3PO_4 + 3HCl`


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