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. $P _4 O _6$ and $H _3 PO _3$
• B. $PCl _5$ and $H _3 PO _4$
• C. $PCl _3$ and $H _3 PO _3$
• D. $POCl _3$ and $H _3 PO _4$

Answer 1

Answer: (C)

$PCl _3$ and $H _3 PO _3$

Answer 2

P4​+8SOCl2​→[A]4PCl3​​+4SO2​+2S2​Cl2​
PCl3​+3H2​O→[B]H3​PO3​​+3HCl