Which of the following is a heterocyclic aromatic compound?

Which of these will produce the highest yield in a Friedel-Crafts reaction?

The total number of isomeric trimethylbenzene is

Identify the final product $C$ in the following reaction sequence:
$1,3-\text{cyclohexadiene}$ $\xrightarrow{NBS} A$ $\xrightarrow{Aq. NaOH} B$ $\xrightarrow{Con. H_2SO_4, \Delta} C$

Which aromatic compound has two double bonds and a five-membered ring?

Identify correct statement/s :
$(A)$ $-OCH_3$ and $-NHCOCH_3$ are activating groups
$(B)$ $-CN$ and $-OH$ are meta directing groups
$(C)$ $-CN$ and $-SO_3H$ are meta directing groups
$(D)$ Activating groups act as ortho- and para-directing groups
$(E)$ Halides are activating groups
Choose the correct answer from the options given below :