Q. Consider the following reaction sequences and choose the correct option. Ph–C≡C–Me —H₂, Pd/C (Lindlar's Catalyst)→ K —HBr→ M Ph–C≡C–Me —Na/liq. NH₃→ L —HBr, benzoyl peroxide→ N
A) M and N are stereoisomers
B) K and L are geometrical isomers
C) K and L are enantiomers
D) M and N are geometrical isomers
Explanation
[Solution from source] Lindlar hydrogenation gives cis-1-phenylpropene (K) and Na/liquid NH₃ gives trans-1-phenylpropene (L), so K and L are geometrical isomers. Ionic HBr addition to K gives PhCHBrCH₂CH₃ (M), while peroxide addition to L gives PhCH₂CHBrCH₃ (N); M and N are position isomers. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.