Write the equations involved in the following reactions:

Reimer - Tiemann reaction

Phenol on mixing with chloroform and NaOH at 340K followed by Acidic hydrolysis, salicyl aldehyde is formed. When carbon tetrachloride (CCl4) is used at the place of chloroform salicylic acid is formed. This type of reaction is known as Reimer - Tiemann reaction.