The bond angle between carbon atoms in a benzene molecule is

In the given reaction: $CH_3COCH_3 \xrightarrow{\text{Conc. } H_2SO_4, \text{Distillation}} [X]$. $[X]$ will be:

Cyclic hydrocarbon molecule $A$ has all the carbon and hydrogen atoms in a single plane. All the carbon-carbon bonds are of the same length and are less than $1.54 \ \mathring{A}$ but more than $1.34 \ \mathring{A}$. The $C-C-C$ bond angle will be:

Which of the following reactions is correct?

What is the correct order of reactivity towards electrophilic substitution for the compounds: Aniline $(I)$,Benzene $(II)$,and Nitrobenzene $(III)$?

Product $(A)$ is