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

To solve the problem, we need to identify an optically active unsaturated hydrocarbon (A) with the lowest molecular mass, and then determine the products of various reactions with this compound.

### Step 1: Identify the structure of compound (A)
The simplest optically active unsaturated hydrocarbon with the lowest molecular mass is 3-methyl-1-butyne. The structure can be represented as follows:

```
H H
\ /
...