Question

convert ethanal to 2-chloroetanal​

Answer 1

Answer:

2-chloroethanol and 1-chloroethanol (which will probably fall apart to acetaldehyde). So, I would go for doing this in two steps.

First, treat ethanol with a strong acid like concentrated phosphoric acid. Under these conditions, ethanol will dehydrate and result in the formation of ethene.

CH3-CH2-OH → CH2=CH2 + H2O

Then, treat the resulting ethene (aka, ethylene) with hypochlorous acid (HOCL) and the product will be 2-chloroethanol as shown below.