Product $(B)$ in the above reaction is

Give the name and structure of an aromatic hydrocarbon with the molecular formula $C_{12}H_{10}$ which contains two benzene rings.

The major product formed in the following reaction sequence is:
$C_6H_5-CHBr-CH_2Br$ $\xrightarrow[(ii) NaNH_2]{(i) alc. KOH}$ $\xrightarrow[(iii) \text{Red hot iron tube}, 873 K]{}$

Are all $ortho$ and $para$ directing groups activators? Give examples.

Styrene at room temperature is

What is the number of monosubstituted products possible for benzene?