Question

CH3-CO-CHO +K2Cr207 +conc H2SO4 =?​

Answer 1

Answer:

This given reaction is called chromyl chloride test.

Mixture of Salt and an equal amount of solid potassium dichromate (K

2

Cr

2

O

7

) is added in a test tube and conc. H

2

SO

4

is further added to it. Heat the test tube and pass the evolved gas through sodium hydroxide solution.

If a yellow solution is obtained, divide the solution into two parts. Acidify the first part with acetic acid and then add lead acetate solution. The formation of a yellow precipitate of lead chromate confirms the presence of chloride ions in the salt.