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Addition Of Sodium Bisulphite...

Addition Of Sodium Bisulphite

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Reaction OF NaHSO3, H-OH, R-OH with Aldyhyde and Ketone, Sodium Bisulphite Test

Write the balanced chemical equations for the following reactions. a. An aqueous solution solution of sodium nitrite is heated with zinc dust and caustic soda solution. b. Sodium iodate is added to a solution of sodium bisulphite.

Knowledge Check

  • Correct stament for nucleophlic addition of sodium bisulphate on carbonyl compounds is :

    A
    This addition is highly sensitive to crowding steric crowding increase, then addition decreases, so aldehyde more reactive than ketone in this reaction
    B
    This reaction used for separation of aldehyde and ketone from a mixture containing some other compounds becouse addition product is a crystaline salt
    C
    It is reversible reaction, so bisulphite addition product regenerate corresponding carbonyl compound on treatment with acid or base
    D
    All of these

  • Cyclic osmium ester of alkene after reacting with aqueous solution of sodium bisulphite gives-

    A
    Diol
    B
    Cis-diol
    C
    Trans-diol
    D
    Salt

  • A solution of sodium thiosulphate on addition of few drops of ferric chloride gives violet colour due to the formation of

    A
    `Na_(2)S_(4)O_(6)`
    B
    `Na_(2)SO_(4)`
    C
    `Fe_(2)(S_(2)O_(3))`
    D
    `Fe_(2)(S_(2)O_(3))_(2)`

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    An aromatic compound (A), on treatment with a saturated solution of sodium bisulphite, produced a solid crystalline product. (A) gave a compound (B) and a sodium salt of an aromatic monobasic acid (C ) on treatment with alkali. (B) contained 77.8% C and 7.4% H and rest, oxygen. The sodium salt on distillation with soda lime gave benzene. If (B) may be oxidised with KMnO_(4) to (C ), find the structural formulae of (A), (B) and (C )

    Give reasons for the following : (a) Carboxylic acids do not give characteristic reactions of carbonyl group. (b) Treatment of benzaldehyde with HCN gives a mixture of two isomers which cannot be separated even by careful fractional distillation. (c) Sodium bisulphite is used for the purification of aldehydes and ketones.

    Sodium iodate is treated with calculated amount of sodium bisulphite to prepare one mole of iodine. How many moles of sodium disulphite are required to prepare one mole of iodine form sodium iodate ?

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