The major product of following reaction is :
`R-C-=Noverset((1)AlH(i-Bu_2))underset((2)H_(2)O)to?`

Options

A. RCHO
B. RCOOH
C. `RCH_2NH_2`
D. `RCONH_2`

Answer

To determine the major product of the reaction involving R-C≡N with the reagents AlH(i-Bu)₂ followed by H₂O, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
The reactant is R-C≡N, which is a nitrile (specifically, a cyanide group). The reagent is AlH(i-Bu)₂, which is an aluminum hydride derivative.

**Hint**: Recognize that R-C≡N is a nitrile and that AlH(i-Bu)₂ is a reducing agent.

2. **Understand the Role of the Reducing Agent**:
Aluminum hydrides are known to be reducing agents. In this case, AlH(i-Bu)₂ is less strong than LiAlH₄, which means it will not fully reduce the nitrile to an amine but will instead partially reduce it.

**Hint**: Different aluminum hydrides have varying strengths as reducing agents; know that AlH(i-Bu)₂ will not fully reduce the nitrile.

3. **Partial Reduction of the Nitrile**:
The AlH(i-Bu)₂ will reduce the nitrile (R-C≡N) to an imine (R-C=N-H). This is because it can add one equivalent of hydrogen to the carbon-nitrogen triple bond.

**Hint**: Remember that nitriles can be reduced to imines or amines depending on the strength of the reducing agent.

4. **Hydrolysis with Water**:
After the partial reduction, we add water (H₂O). The imine (R-C=N-H) will undergo hydrolysis. During hydrolysis, the imine bond (C=N) will break, leading to the formation of an aldehyde (R-C=O) and ammonia (NH₃).

**Hint**: Hydrolysis of an imine typically results in the formation of an aldehyde and ammonia.

5. **Final Product**:
The final product after hydrolysis will be R-CHO, which is an aldehyde. The ammonia produced can be considered a byproduct.

**Hint**: Aldehydes are characterized by the functional group -CHO, and they can be formed from the hydrolysis of imines.

### Conclusion:
The major product of the reaction is R-CHO (an aldehyde).

**Final Answer**: The major product is R-CHO.