Consider the following sequence of reactions :
`HO - overset(overset(O)(||))C - underset(underset(CH_3)(|)) overset(overset(CH_3) (|))C - C -= N overset(200^(@) C) (to) A underset(H_2 O) overset(LiAIH_4) (to) B,` (B) is

Options

A.
B.
C. `HO - H_(2) C - underset(underset(CH_3)(|)) overset(overset(CH_3) (|))C - CH_2 -NH_2`
D.

Explanation

To solve the given sequence of reactions, we will break down the steps systematically.

### Step 1: Identify the starting compound
The starting compound is given as:
\[ \text{HO - C(=O) - C(CH_3)(CH_3) - C} \]
This can be interpreted as a carboxylic acid derivative, specifically a carboxylic acid with two methyl groups attached to the central carbon.

### Step 2: Heating the compound
When this compound is heated at 200°C, the reaction leads to the formation of a nitrile. The heating causes the elimination of water and the formation of a carbon-nitrogen triple bond (nitrile). The product after this step (let's call it A) can be represented as:
\[ \text{C(CH_3)(CH_3) - C} \equiv \text{N} \]
This indicates that the compound now has a nitrile functional group.

### Step 3: Reduction using Lithium Aluminium Hydride (LiAlH4)
Next, we treat the nitrile (A) with lithium aluminium hydride (LiAlH4) followed by hydrolysis (addition of water). The nitrile group will undergo reduction to form a primary amine. The reaction can be summarized as:
\[ \text{R - C} \equiv \text{N} + \text{LiAlH}_4 + \text{H}_2\text{O} \rightarrow \text{R - CH}_2\text{NH}_2 \]
Where R represents the carbon chain from the original compound.

### Step 4: Final structure of product B
The final product (B) will have the structure:
\[ \text{C(CH_3)(CH_3) - CH}_2\text{NH}_2 \]
This indicates that the nitrile has been reduced to a primary amine, specifically an aminoalkane.

### Conclusion
Thus, the final product B is:
\[ \text{C(CH_3)(CH_3) - CH}_2\text{NH}_2 \]
This can also be represented as:
\[ \text{(CH}_3)_2\text{C} - \text{CH}_2\text{NH}_2 \]