pBlock ElementsII 1 Question 12

12. The product formed in the reaction of SOCl2 with white phosphorus is

(2014 Adv.)

(a) PCl3

(b) SO2Cl2

(c) SCl2

(d) POCl3

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Answer:

Correct Answer: 12. (a)

Solution:

  1. PLAN This problem is based on chemical properties of phosphorus.

White phosphorus on reaction with thionyl chloride (SOCl2) produces phosphorus trichloride.

P4(s)+8SOCl2(l)4PCl3(l)+4SO2(g)+2S2Cl2(g)

But if amount of thionyl chloride (SOCl2) is in excess then it produces phosphorus pentachloride.

P4+10SOCl2(l)4PCl5+10SO2



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