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  4. Which one of the following shows haloform test?

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Q. Which one of the following shows haloform test?

Rajasthan PMTRajasthan PMT 2003

Solution:

In haloform reaction, compounds having the structure
$R - \underset{\overset{|}{O}H}{CH} - CH_3$ or $ R - \underset{\overset{||}{O}}{C} - CH_3$
are treated with an excess of iodine solution and alkali to produce iodoform.
$\underset{\text{Butanol-2}}{\overset{1}{CH_3} \underset{\overset{|}{O}H}{\overset{2}{CH}} - \overset{3}{CH_2} - \overset{4}{CH_3}} + \underset{\text{Halogen}}{NaOH + X_2} \to \underset{\text{Haloform}}{CHX_3}$
Therefore, $2$ -butanol responds to haloform test.