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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.
H3CCHO+HNaOH+3I2CH3I3+HCOONa+3NOI+3H2O
Acetaldehyde gives Iodoform test.
HCHO+4NaOH+3I2 No Iodoform.
Formaldehyde does not gives Iodoform test.

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