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JEE Main202325 Jan 2023Morning ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

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

Options

  1. AP 4 O 6 and H 3 PO 3
  2. BPCl 3 and H 3 PO 3
  3. CPCl 5 and H 3 PO 4
  4. DPOCl 3 and H 3 PO 4

Correct answer

B. PCl 3 and H 3 PO 3

Step-by-step solution

Phosphorus trichloride is obtained by the action of thionyl chloride with white phosphorus P 4 + 8 SOCl 2 → 4 PCl 3 [ A ] + 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 → H 3 PO 3 [ B ] + 3 HCl

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