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Newman projections P, Q, R and S are shown below : (P) CH 3 CH 3 C 2 H 5 H 3 C CH 3 HO (Q) OH H C 2 H 5 H CH 3 H CH 3 H 3 C (R) CH 3 H CH 3 HO C 2 H 5 C 2 H 5 (S) CH 3 CH(CH 3 ) 2 H H OH C 2 H 5 Which one of the following options represents identical molecules ?

P and Q
Q and S
Q and R
R and S

Correct answer: Q and R

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