Give the structure of an optically active unsaturated hydrocarbon `(A)` with the lowest molecular mass. Give the products of `(A)` with `:`
`a.` `H_(2)+Pd+BaSO_(4)+S` or quinoline in boiling xylene,
`b.` `K+Liq.NH_(3)+ETOH,`
`c.` `D_(2)+`Piosoned `Pd,`
`d.` `Na+Liq.ND_(3)+EtOH`, and
`e.` `Na+Liq. NH_(3)+EtOD.`

Explanation

For a compound to be optically active, four different groups should be attached to the `C` atom, one group should be `(H)`, the second group should be `(Me)`, the third group should be an alkene `(C_(2)H=CH-)` and the fourth group should be an alkyne `(CH-=C-).`

`O.A.,`an unsaturated compound, with the lowest molecular mass.