Phenol reacts with acetone in the presence of concentrated sulphuric acid to form a $C_{15}H_{16}O_2$ product. Which of the following compounds is this product?

When phenol is treated with $CHCl_3$ and $NaOH$,which of the following products is obtained?

The most suitable method for the separation of a $1:1$ mixture of $o-$ and $p-$ nitrophenols is:

What is the name of the following reaction?

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

The given reaction can occur in the presence of:
$(1)$ Bromine water
$(2)$ $Br_2$ in $CS_2, 273 \ K$
$(3)$ $Br_2 / FeBr_3$
$(4)$ $Br_2$ in $CHCl_3, 273 \ K$
Choose the correct answer from the options given below:
[Image: Phenol reacting to form p-bromophenol as the major product]