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  4. Among the following, the number of compounds that can react with PCl5 to give POCl3 is O2,C O2,S O2,H2O, H2SO4,P4O10.

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Q. Among the following, the number of compounds that can react with $PCl_5$ to give $POCl_3$ is $O_2,C O_2,S O_2,H_2O, H_2SO_4,P_4O_{10}.$

IIT JEEIIT JEE 2011The p-Block Elements - Part2

Solution:

$PCl_5\,$ produces $\, POCl_3$ with the following reagents
$PCl_5 + SO_2 \longrightarrow POCl_3 + SOCl_2$
$PCl_5 + H_2O \longrightarrow POCl_3 + 2HCl$
$2PCl_5 + H_2SO_4 \longrightarrow S O_2Cl, + 2POCl_3 + 2HCl$
$6PCl_5 + P_4O_{10} \longrightarrow 10POCl_3$