Which one of the following gives a sooty flame on combustion?

Which of the following hydrogens is most easily abstracted on reaction with bromine free radicals,$Br^{\cdot}$?

In which of the following are all carbon-carbon bond lengths equal?

The total number of aromatic species generated in the following reactions is:

The number of $\pi$ electrons in the following molecule is:

Consider the reaction sequence below:
Anisole $\xrightarrow[AlCl_3]{\text{Succinic anhydride}} A$ $\xrightarrow[\text{Clemmensen's reduction}]{\text{Cyclization}} X$
Identify $X$.