Among the following the number of compounds that can react with $P C l_{5}$ to give $P O C l_{3}$ is :
$O_{2}, C O_{2}, S O_{2}, H_{2} O, H_{2} S O_{4}, P_{4} O_{10}$

Question

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Answer 1

Except for $O_{2}$ and $C O_{2}$ all others react with $P C l_{5}$ to give $P O C l_{3}$ .
$S O_{2} (g) + P C l_{5} (s) \to S O C l_{2} (l) + P O C l_{3} (l)$
$P C l_{5} + H_{2} O \to P O C l_{3} + 2 H C l$
$H_{2} S O_{4} + 2 P C l_{5} \to 2 P O C l_{3} + S O_{2} C l_{2} + H C l$
$P_{4} O_{1} 0 + 6 P C l 5 \to 10 P O C l_{3}$
So there 4 compounds which can react with $P C l_{5}$ .
Hence option C is correct.

Answer 2

Except for

O_{2}

and

C O_{2}

all others react with

P C l_{5}

to give

P O C l_{3}

.

S O_{2} (g) + P C l_{5} (s) \to S O C l_{2} (l) + P O C l_{3} (l)

P C l_{5} + H_{2} O \to P O C l_{3} + 2 H C l

H_{2} S O_{4} + 2 P C l_{5} \to 2 P O C l_{3} + S O_{2} C l_{2} + H C l

P_{4} O_{1} 0 + 6 P C l 5 \to 10 P O C l_{3}

So there 4 compounds which can react with

P C l_{5}

.
Hence option C is correct.