Chemistry - STEREO ISOMERISM Question with Solution | TestHub

One plane of symmetry is the molecular plane itself, which contains all the atoms of the fused ring system. The second plane is perpendicular to the molecular plane and bisects the shared C₉-C₁₀ bond, reflecting the two rings into each other. The third plane is perpendicular to the molecular plane and passes through C₂, C₃, C₆ and C₇, reflecting the two halves of each ring into each other.

Ans. 3 planes of symmetry (the molecular plane plus two perpendicular planes).