JEE Advance - Chemistry (2011 - Paper 2 Offline - No. 17)
Among the following, the number of compounds that can react with PCl5 to given POCl3 is _____________.
O2, CO2, SO2, H2O, H2SO4, P4O10
Answer
5
Explanation
The following reactions show how PCl5 reacts with different compounds to form POCl3 :
$$CO_2 + PCl_5 \rightarrow POCl_3 + COCl_2$$
$$H_2O + PCl_5 \rightarrow POCl_3 + 2HCl$$
$$SO_2 + PCl_5 \rightarrow POCl_3 + SOCl_2$$
$$P_4O_{10} + 6PCl_5 \rightarrow 10POCl_3$$
$$H_2SO_4 + PCl_5 \rightarrow POCl_3 + HSO_3Cl + HCl$$
From these reactions, it is clear that CO2, H2O, SO2, P4O10, and H2SO4 can react with PCl5 to give POCl3.
There are 5 compounds that meet this criterion.
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