Which of the following statements about the chlorides of phosphorus are correct?

A $PCl X_{5}$ converts $C X_{2} H X_{5} OH$ to $C X_{2} H X_{5} Cl$ , with $POCl X_{3}$ and $HCl$ as by-products.
B $PCl X_{3}$ has a trigonal pyramidal molecular shape.
CHydrolysis of $PCl X_{3}$ gives $H X_{3} PO X_{4}$ .
DHydrolysis of $PCl X_{5}$ with excess water gives $POCl X_{3}$ as the final phosphorus-containing product.

Answer: A, B

PCl X_{3}

has three bond pairs and one lone pair (pyramidal). Excess water takes

PCl X_{5}

all the way to

H X_{3} PO X_{4}

(

POCl X_{3}

is only the intermediate), and

PCl X_{3}

gives

H X_{3} PO X_{3}

(P stays +3).

C X_{2} H X_{5} OH + PCl X_{5} C X_{2} H X_{5} Cl + POCl X_{3} + HCl

. Correct: A, C.