For the conversion of alkyne to cis-alkene, `H_2+` Lindlar's catalyst is used:

Which of the statements are wrong:

Options

A. (a) The function of `BaSO_4` or `CaCO_3` is to reduce the surface area of finely divided catalyst Pd so that adsorption of `H_2` on `Pd` is reduced.
B. (b) The function of S or quinoline is to remove excess of `H_2`. It is done through the formation of `H_2S(g)` with S or by absorption of excess `H_2` by quinoline to form (I) or (II).

C. (c) Boiling xylene acts as a solvent to dissolve the reactant (alkyne).
D. (d) Boiling xylene acts as inhibitor, decreasing the asborption of `H_2` on finely divided catalyst `Pd` or `Pt`.

Answer

D

Explanation

Compound III is chiral and shows optical isomerism. Statements a, b, and c are self explanatory.