See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

(P) H /   OH  (Minor) (Major) (Q) H /   C H3 OH Ph  C H3 Ph C H3 Ph (Major) (Minor) (R) H /   OH   (Major) (Minor) (Minor) (S) H /   OH cannot undergo dehydration as bridge head C-atom can never be sp2-hybridised.