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Which of the following is not formed on hydrolysis of PCl5?

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in Chemistry – Class 12 by (188k points)
Which of the following is not formed on hydrolysis of PCl5?

(a) POCl3

(b) H3PO4

(c) HCl

(d) PCl3

I got this question in an interview.

The question is from P-Block Elements in section P-Block Elements of Chemistry – Class 12

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Best answer
Correct answer is (d) PCl3

The best explanation: In moist air, phosphorus pentachloride undergoes hydrolysis to first form POCl3 and then finally phosphoric acid.

PCl3 + H2O → POCl3 + 2HCl

POCl3 + 3H2O → H3PO4 + 3HCl

However, with excess of water, PCl5 reacts violently to form H3PO4 and HCl.

PCl5 + 4H2O (excess) → H3PO4 + 5HCl.

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