Identify the meta-directing group from the following.

Which isomer of xylene can give three different monochloroderivatives?

On attachment of $H$ and $Br$ from the $HBr$ to $C_6H_5$ free radical,what can be formed?

What are $X$ and $Y$ respectively in the following reactions?

The electrophile $NO_2^+$ reacts with which of the following compounds? In which case will $NO_2^+$ attack at the meta position?
$(I)$ $C_6H_5-CCl_3$
$(II)$ $C_6H_5-NO_2$
$(III)$ $C_6H_5-CHO$
$(IV)$ $C_6H_5-O^-$

The correct order of the rate of $EAS$ (electrophilic aromatic substitution) for the following compounds is: