Complete the following reactions and identify A, B and C,
(i) `A+H_(2)(g) overset(Pd//BaSO_(4))to (CH_(3))_(2)CH-CHO`
(ii) `CH_(3)-overset(H_(3)C)overset(|)underset(CH_(3))underset(|)C-overset(O)overset(||)C-CH_(3)+NaOI to B+C`

Explanation

To solve the problem, we need to complete the reactions and identify the compounds A, B, and C.

### Step-by-Step Solution:

**1. Identify Compound A:**
- The reaction given is:
\[
A + H_2(g) \overset{(Pd/BaSO_4)}{\rightarrow} (CH_3)_2CH-CHO
...