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Question

The compound that gives haloform reaction among the following reaction is
  1. 2-pentanone
  2. Ethanol
  3. 2-hexanone
  4. all of the above


Solution

The correct option is D all of the above
 All  ketones and aldehydes that has CH3CO group will answer haloform test.
(a) 2-Pentanone
(CH3CH2CH2O||CCH3)
(b) 
Ethanol under the reaction condition is oxidised to acetaldehyde (CH3CHO )and hence it shows haloform test.
(c) 2-hexanone
 (CH3CH2CH2CH2O||CCH3).
As all the above structures contain CH3CO group, they will give positive haloform test.

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