The species, which is not aromatic is

The major product of the following reaction is:

${\mathrm{CH}}_2=\mathrm{CHBr}\underset{\mathrm{Red} \mathrm{hot} \mathrm{iron} \mathrm{tube}, 873 \mathrm{K}}{\overset{{\mathrm{NaNH}}_2}{\to }}\mathrm{P}$

Identify the product of the following reaction.