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NEET2026ChemistryHydrocarbonsActual

Consider the following reaction sequences and choose the correct option.

Options

  1. AM and N are stereoisomers
  2. BK and L are geometrical isomers
  3. CK and L are enantiomers
  4. DM and N are geometrical isomers

Correct answer

B. K and L are geometrical isomers

Step-by-step solution

The given starting material is 1-phenylpropyne, Ph - C C - Me . Reduction of the alkyne with H ₂ in the presence of Lindlar's catalyst ( Pd/C poisoned with BaSO ₄ or quinoline) proceeds via syn-addition. This yields the cis-alkene. Therefore, K is cis-1-phenylpropene. Reduction of the alkyne with Na in liquid NH ₃ (Birch reduction conditions) proceeds via anti-addition. This yields the trans-alkene. Therefore, L is trans-1-phenylpropene. Since K is the cis-isomer and L is the trans-isomer of the same compound, they

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