Which of the following will not give iodoform test?
Correct answer: B. Aceteldehyde
- A. Formaldehyde
- B. Aceteldehyde
- C. Acetone
- D. Ethanol
Explanation
Formaldehyde does not have a methyl group adjacent to a carbonyl group, which is necessary for the iodoform reaction to occur. The iodoform reaction involves the oxidation of the carbonyl compound, followed by the substitution of one of the carbonyl's hydrogen atoms with iodine. Since formaldehyde lacks the necessary structure for this reaction, it will not produce iodoform
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About Reactivity of Aldehydes and Ketones
The polar carbonyl group makes aldehydes and ketones undergo nucleophilic addition, reduction and condensation reactions. Aldehydes are generally more reactive and oxidise readily to carboxylic acids, whereas ketones resist mild oxidation; reactions with hydrogen cyanide, sodium bisulfite and 2,4-DNP help identify their behaviour.
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