In which of the following compounds does the $C-H$ bond exhibit the lowest bond dissociation energy?

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 :

Arrange the following in increasing order of reactivity towards nitration:
$A$. $p$-xylene
$B$. bromobenzene
$C$. mesitylene
$D$. nitrobenzene
$E$. benzene
Choose the correct answer from the options given below.

$A$ hydrocarbon does not decolorize alkaline $KMnO_4$ solution and does not give a precipitate with ammoniacal silver nitrate. This hydrocarbon is .......

What type of difference is observed in the hybridization of carbon in benzene during nitration and the formation of the $\sigma$-complex?

The aromatic compound/species with the maximum number of $\pi$-electrons is: