Question

The ene-yne that produces a chiral compound upon treatment with Lindlar's catalyst is:

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

Lindlar's catalyst is a palladium catalyst $\left(Pd/CaC{O}_3\right)$ deliberately poisoned with lead $\left[\right(Pb\left(OAc{)}_2\right]$, which is used to reduce alkynes to Z-alkenes.

Here, (b) has a chiral centre and is optically active. After treatment with Lindlar's catalyst, the product formed also retained its chirality. E and Z isomers are taken as different substituents.