Step 1: Ph-C≡C-CH₃ + H₂/Lindlar (K).
Lindlar catalyst → cis addition → cis-1-phenyl-1-propene = Z-isomer (K). Ph અને CH₃ = same side.
Step 2: Ph-C≡C-CH₃ + Na/Liq.NH₃ (L).
Na/Liq.NH₃ = Birch reduction → trans addition → trans-1-phenyl-1-propene = E-isomer (L). Ph અને CH₃ = opposite sides.
Step 3: K અને L = cis/trans → geometric isomers.
K = Z-Ph-CH=CH-CH₃; L = E-Ph-CH=CH-CH₃. Same molecular formula, different spatial arrangement = Geometric isomers.
\\[ \boxed{oxed{K ext{ અને } L = ext{Geometric isomers (cis-trans)}} \} \]