pBlock ElementsII - Result Question 127
####12. The product formed in the reaction of $SOCl _2$ with white phosphorus is
(2014 Adv.)
(a) $PCl _3$
(b) $SO _2 Cl _2$
(c) $SCl _2$
(d) $POCl _3$
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Solution:
- PLAN This problem is based on chemical properties of phosphorus.
White phosphorus on reaction with thionyl chloride $\left(SOCl _2\right)$ produces phosphorus trichloride.
$P _4(s)+8 SOCl _2(l) \longrightarrow 4 PCl _3(l)+4 SO _2(g)+2 S _2 Cl _2(g)$
But if amount of thionyl chloride $\left(SOCl _2\right)$ is in excess then it produces phosphorus pentachloride.
$P _4+10 SOCl _2(l) \longrightarrow 4 PCl _5+10 SO _2$
