Among the following,the number of aromatic compound$(s)$ is

Which of the following is most reactive towards electrophilic nitration?

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 :

Which one of the following functional groups is not meta directing?

Among the following,the aromatic compounds are:
$(A)$ Heptafulvene
$(B)$ Benzene
$(C)$ Cyclopentadienyl anion
$(D)$ Cyclopentadienyl cation
Choose the correct answer from the following options:

Which of the following is a Friedel-Crafts reaction?