Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B] a dibasic acid. [A] and [B] are respectively (A) P4O6 and H3PO3 (B) PCl5 and H3PO3 (C) PCl3 and H

Question

Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B] a dibasic acid. [A] and [B] are respectively

(A) P4O6 and H3PO3
(B) PCl5 and H3PO3
(C) PCl3 and H3PO3
(D) POCl3 and H3PO4

Prashant Kotian · Accepted Answer

Correct answer: C. P4 + 8SOCl2  4PCl3 + 4SO2 + 2S2Cl2 (A) PCl3 + 3H2O  H3PO3 + 3HCl (A) (B)

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