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  4. Ethyl phenyl acetylene (1-phenyl- 1-butyne) on reduction with partially deactivated palladised charcoal (Lindlar's catalyst) gives

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Q. Ethyl phenyl acetylene (1-phenyl- 1-butyne) on reduction with partially deactivated palladised charcoal (Lindlar's catalyst) gives

TS EAMCET 2020

Solution:

Lindlar catalyst is partially deactivated catalyst composed of $BaSO _{4}$ coated with Pd poisoned with quinoline.
It reduce $(C \equiv C)$ to $(C=C)$ bond, occurs via syn-addition and gives cisalkene.

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