Non Benzenoid aromatic compounds is
[Step 1]:
Option (1) Methyl benzene
is a benzenoid aromatic compound.
[Step 2]:
Option (2) benzaldehyde
is a benzenoid aromatic compound
[Step 3]:
Option (3) Aniline
is a benzenoid aromatic compound
[Step 4]:
Option (4) Tropolone
show aromaticity but do not contain any benzene ring.Therefore it is a non-benzenoid aromatic compound.