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        <div id="content-top1">Page 13 - index</div>
        <div id="content-top2">P. 13</div>
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    <pre style="white-space:pre-line"><code>12, Aldehydes and Ketones  eLearn.Punjab

     Bisulphite on heating with a dilute mineral acid (HCl
     or H2SO4), regenerates the parent aldehyde or ketone.

The reaction is used for the separation and purification of carbonyl
compounds from non-carbonyl compounds such as alcohols.
Mechanism:
Sodium bisulphite ionises to form sulphite ions.

 The sulphite ion acts as a nucleophile, since the sulphur atom
 is more nucleophilic than oxygen, a Câ€”S bond is formed.

   Proton is attached to the negatively charged oxygen atom to form bisulphite
   addition product.

                                                     13</code></pre>
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