The correct option is A 6
P : Total number of polar compounds ⇒ (i), (ii), (iii), (iv), (v), (vi), (vii)
Q : Total number of planar compounds ⇒ (i), (ii), (iii), (v), (iv)
R : Total number of non polar compounds ⇒ (viii)
S : Total number of non planar compounds ⇒ (iv), (vii), (viii)
Therefore, [P2−Q2R+S] = 6.