The product of the following reaction is:

Which one of the following reactions does $NOT$ give benzene as the product?

What are $X$ and $Y$ in the following reaction sequence?
$CH_3(CH_2)_5CH_3 \stackrel{X}{\longrightarrow} C_7H_8 \stackrel{Br_2}{\Delta} Y$

The major product of the reaction shown below is:

Which among the following pairs of the structures will give different products on ozonolysis? (Consider the double bonds in the structures are rigid and not delocalized.)

Which of the following Friedel-Crafts reactions is incorrectly written?