Correct Answer - B
Catechol (o-dihydroxybenzene) is conveniently prepared in the laboratory by the action of alkaline hydrogen peroxide on salicylaldehyde:
![image](https://learnqa.s3.ap-south-1.amazonaws.com/images/16116498762731028221611649876.png)
This reaction, which is characteristic of `o-`and `p-`hdroxybenzaldehydes, is known as the dakin reaction. it involves a `1,2-`shift.
![image](https://learnqa.s3.ap-south-1.amazonaws.com/images/16116498777152464831611649877.png)