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

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Phosphorus trichloride is obtained by the action of thionyl chloride with white phosphorus

$P_{4} + 8 {SOCl}_{2} \to \underset{[A]}{4 {PCl}_{3}} + 4 {SO}_{2} + 2 S_{2} {Cl}_{2}$

Phosphorus trichloride is a colourless oily liquid and hydrolyses in the presence of moisture give dibasic phosphorus acid.

${PCl}_{3} + 3 H_{2} O \to \underset{[B]}{H_{3} {PO}_{3}} + 3 HCl$

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