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How does concentrated H(2)SO(4) react wi...

How does concentrated `H_(2)SO_(4)` react with `PCl_(5)`?

Text Solution

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Concentrated sulphuric acid reacts with phosphorous pentachloride to give chloro sulphuric acid which further reacts with phosphorous pentachloride to give sulphuryl chloride.
`HO-SO_(2)-OH+PCl_(5)rarr Cl+SO_(2)-OH+POCl_(3)+HCl`
`underset("(Chloro sulphuric acid)")(Cl-SO_(2)-OH)+underset("(Sulphuryl chloride)")(PCl_(5)rarr Cl-SO_(2)-Cl+POCl_(3)+HCl)`
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Knowledge Check

  • When concentrated H_(2)SO_(4) is heated with P_(2)O_(5) , the acid is converted into

    A
    a mixture of sulphur dioxide and sulphur trioxide
    B
    sulphur trioxide
    C
    sulphur dioxide
    D
    sulphur

  • On heating ethanol with exess of concentrated H_(2)SO_(4) " to " 170^(@)C , the product obtained is

    A
    ethyne
    B
    ethane
    C
    ethene
    D
    ethoxy ethane

  • Excess of PCl_(5) reacts with concentrated H_(2)SO_(4) giving

    A
    chlorosulphuric acid
    B
    sulphurous acid
    C
    sulphuryl chloride
    D
    thionyl chloride

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