Question

give a chemical test to distinguish between formaldehyde and acetaldehyde

Answer 1

I hope this solution help you

Answer 2

Hey dear,

● Answer -
Formaldehyde and acetaldehyde can be distinguished by iodoform test.

● Iodoform test -
- Methyl ketones react with iodine and potassium hydroxide to give yellow precipitate.

● Acetaldehyde vs Formaldehyde -
- Acetaldehyde reacts with iodine and KOH to give sodium salt of carboxylic acid.
CH3CHO + 4NaOH + 2I2 --> CH3I + HCOONa + 3NaI + 3H2O

- Formaldehyde doesn't give iodoform test.
HCHO + NaOH + I2 --> NO REACTION


Hope this helps you...