Question

Phenanthrene is antiaromatic.

• A. True
• B. False

Answer 1

The correct option is B False

Phenanthrene is aromatic. It has planar cyclic conjugated system of 14 pi electrons.
A cyclic planar compounds with a conjugated system of 4n $+$ 2 pi electrons is aromatic.
Note:
$4n+2=4\left(3\right)+2=14$
$n=3$