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  4. Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B], a dibasic acid. [ A ] and [ B ] are respectively

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Q. Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B], a dibasic acid. $[ A ]$ and $[ B ]$ are respectively

JEE MainJEE Main 2023The p-Block Elements - Part2

Solution:

$P _4+8 SOCl _2 \rightarrow \underset{[A]}{4 PCl _3}+4 SO _2+2 S _2 Cl _2$
$PCl _3+3 H _2 O \rightarrow \underset{[B]}{H _3 PO _3}+3 HCl$