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When ethanol reacts with PCl5, it gives three products which include chloroethane and hydrochloric acid. What is the third product?

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When ethanol reacts with PCl5, it gives three products which include chloroethane and hydrochloric acid. What is the third product?

(a) Phosphorus acid

(b) Phosphoric acid

(c) Phosphorus trichloride

(d) Phosphoryl chloride

This question was addressed to me during a job interview.

The query is from Methods of Preparation of Haloalkanes topic in chapter Haloalkanes and Haloarenes of Chemistry – Class 12

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Best answer
Right option is (d) Phosphoryl chloride

The best explanation: The reaction of CH3CH2OH with PCl5 yields CH3CH2Cl, POCl3 (phosphoryl acid) and HCl. This is a method of preparation of chloroalkanes from alcohols.

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