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Write about idoform test for 2 marks

Posted by Sneha Kakadiya 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 4 years ago

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. Given below are a few example reactions for positive iodoform tests.

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