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Preparations and Uses of Sodium Carbonate

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Question

Write a chemical test to distinguish between formaldehyde and acetaldehyde.

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Solution

Ionization test is used for differentiation of acetaldehyde and formaldehyde.
$H_{3} C C H O + H N a O H + 3 I_{2} ⟶ C H_{3} I_{3} + H C O O N a + 3 N O I + 3 H_{2} O$
Acetaldehyde gives Iodoform test.
$H C H O + 4 N a O H + 3 I_{2} ⟶$ No Iodoform.
Formaldehyde does not gives Iodoform test.

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