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How does glycerol react with (i) PCl(5) ...

How does glycerol react with (i) `PCl_(5)` (ii) `KHSO_(4)`.

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When glycerol is heated with dehyrating agents such as Con. `H_(2)SO, KHSO_(4)` etc……., it undergoes dehydration to form acrolein.
`underset("Propan-1,2,3- triol") underset(CH_(2)-OH)underset(|)overset(CH_(2)OH)overset(|)(CH-OH) overset(KHSO_(4))underset(A) to underset(CHO)underset(|)overset(CH_(2)) overset(||)CH`
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