Question

write a chemical test to distinguish between formal dehyde and accetaldehyde.​

Answer 1

Solution. Acetaldehyde, when heated with I2 and NaOH, gives a yellow precipitate of iodoform (Iodoform test) whereas formaldehyde does not give a yellow precipitate of iodoform.

Answer 2

Explanation:

Ionization test is used for differentiation of acetaldehyde and formaldehyde.

H

3

CCHO+HNaOH+3I

2

⟶CH

3

I

3

+HCOONa+3NOI+3H

2

O

Acetaldehyde gives Iodoform test.

HCHO+4NaOH+3I

2

⟶ No Iodoform.

Formaldehyde does not gives Iodoform test.