Complete the following reactions
(i) `CH_(3)-overset(O)overset(||)(C)-CH_(3)overset(CH_(3)MgBr)underset("ether(dry)")rarrAoverset(H_(3)O^(+))rarrB` (ii) `CH_(3)-CH_(2)-CH_(2)-CHOoverset(Ni//H_(2))rarrA`

Explanation

Let's solve the reactions step by step.

### Reaction (i):
1. **Identify the Reactants**: The first reaction involves acetone (CH₃COCH₃) and a Grignard reagent (CH₃MgBr) in dry ether.

2. **Mechanism of Reaction**: The Grignard reagent acts as a nucleophile. The carbonyl carbon in acetone is electrophilic due to the electronegativity of oxygen. The Grignard reagent will attack the carbonyl carbon, leading to the formation of a tetrahedral intermediate.

3. **Formation of the Addition Product**: The nucleophilic attack results in the addition of the methyl group from the Grignard reagent to the carbonyl carbon of acetone, forming a new carbon-carbon bond. The structure of the addition product can be represented as:
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