$A$ and $B$ are isomers. Product $B$ is: (Dewar's Benzene is $A$)

Identify the end product $(Z)$ in the sequence of the following reactions:
$C_2H_4Br_2$ $\xrightarrow[(ii) NaNH_2]{(i) Alc. KOH} X$ $\xrightarrow[873 \ K]{\text{Red hot Fe tube}} Y$ $\xrightarrow[\text{Anhy } AlCl_3, \Delta]{CH_3COCl} Z$

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 type of chemical reactions are given by arene compounds? Give their suitable examples and reactions.

What is the major product of the following reaction?
$1,4-dichlorocyclohexa-1,4-diene \xrightarrow{Na, \text{dry ether}} ?$

Which of the following can give $ESR$ (Electrophilic Substitution Reaction) at the fastest rate?