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Question
Which of the following does not give iodoform test?
Which of the following does not give iodoform test?
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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 R−CO−CH3 or alcohols with the structure R−CH(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).
Iodoform test is used to check the presence of carbonyl compounds with the structure R−CO−CH3 or alcohols with the structure R−CH(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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