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Question

Which of the following does not give iodoform test?

A
n-Butyl alcohol
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B
sec-Butyl alcohol
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C
Acetophenone
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D
Acetaldehyde
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Solution

The correct option is A n-Butyl alcohol
Iodoform test is used to check the presence of carbonyl compounds with the structure RCOCH3 or alcohols with the structure RCH(OH)CH3 in a given unknown substance.

When Iodine and sodium hydroxide are added to a compound that contains either a methyl ketone or a secondary alcohol with a methyl group in the alpha position, a pale yellow precipitate of iodoform or triiodomethane is formed. It can be used to identify aldehydes or ketones. If an aldehyde gives a positive iodoform test, then it must be acetaldehyde since it is the only aldehyde with a CH3C=O group.

For haloform reaction, 3 hydrogens on alpha carbon are required. As option (a) is a primary alcohol and it does not have any alpha H, it will not give positive iodoform test. Hence, the correct answer is option (a).

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