Number of isomeric aromatic amines with molecular formula C 8 H 11 N , which can be synthesized by Gabriel…

${\mathrm{C}}_8{\mathrm{H}}_{11}\mathrm{N}$

Degree of unsaturation $=4$, The degree of unsaturation indicates the total number of pi bonds and rings within a molecule which makes it easier for one to figure out the molecular structure

So, number of aromatic amines $=5$