The electrophile involved in the Reimer-Tiemann reaction is

What is the product formed when cumene is air oxidized in the presence of cobalt naphthenate and further treated with dilute acid?

In which of the following reactions does carbon$-$carbon bond formation take place?

The reactant is $4-hydroxy-3-methylbenzenesulfonic acid$. The reaction with $Br_2$ in $H_2O$ (bromine water) is an electrophilic aromatic substitution. The $-OH$ group is strongly activating and ortho/para directing. The $-SO_3H$ group is a good leaving group in the presence of excess bromine water. Predict the product of the reaction: $\xrightarrow{Br_2, H_2O} \text{Product}$

What is $X$ in the given reaction?

Which is the final product of the Reimer-Tiemann reaction?