(C) Lindlar catalyst is a partially deactivated catalyst composed of $BaSO_4$ coated with $Pd$ poisoned with quinoline.It reduces $(C \equiv C)$ to $(

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(C) Lindlar catalyst is a partially deactivated catalyst composed of $BaSO_4$ coated with $Pd$ poisoned with quinoline.It reduces $(C \equiv C)$ to $(C=C)$ bond,occurs via syn-addition,and gives a $cis$-alkene.For $1$-phenyl-but-$1$-yne $(C_2H_5-C \equiv C-C_6H_5)$,the reduction yields $cis$-$1$-phenyl-but-$1$-ene,which corresponds to option $C$.

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Ethyl phenyl acetylene ($1$-phenyl-but-$1$-yne) on reduction with partially deactivated palladised charcoal (Lindlar's catalyst) gives:

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Ethyl phenyl acetylene ($1$-phenyl-but-$1$-yne) on reduction with partially deactivated palladised charcoal (Lindlar's catalyst) gives:

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