Question

write down the reaction between acetic acid and chlorine in the presence of small amount of red phosphorus?

Answer 1

If acetic acid and chlorine will react Chloroacetic acid will be formed.
CH3COOH + Cl2 gives rise to ClCH2CO2H.
Hope it'll be helpful.

Answer 2

Answer: The product for the above reaction is 2-chloro-ethanoic acid.

Explanation:

When an acid  having $\alpha$ - hydrogen atoms reacts with a halogen in the presence of red phosphorous, it results in the chlorination of $\alpha$ - carbon to produce 2-chloroethanoic acid.

This reaction is a very well known reaction named as Hell-Vohlard Zelinsky.

The equation for the reaction is given below in the image.