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Chloral does not undergo Cannizzaro reaction because the anion formed is very stable do to the electron withdrawing effect of the three chloro group attached to the alpha carbon. As a result cleavage takes place and the products formed initially are CCl3- and HCOOH. Then by maintaining Bronsted Lowry concept an hydride ion transfer takes place and the final products are chloroform and HCOO- ion.

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Q: Why chloral undergoes cannizzaro reaction?
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