The reaction of RCN with R'MgX, followed by hydrolysis gives

Options

A. an aldehyde
B. a ketone
C. `2^@` alcohol
D. `3^@` alcohol

Answer

To solve the problem of what compound is formed when RCN reacts with R'MgX followed by hydrolysis, we can break down the process step by step.

### Step-by-Step Solution:

1. **Identify the Reactants**:
- We have RCN, which is a nitrile (where R is an organic group and C is bonded to a nitrogen atom with a triple bond).
- We also have R'MgX, which is a Grignard reagent (where R' is another organic group, Mg is magnesium, and X is a halogen).

2. **Reaction of Nitrile with Grignard Reagent**:
- When RCN reacts with R'MgX, the nucleophilic carbon (C) in the nitrile reacts with the electrophilic carbon (C) in the Grignard reagent.
- The reaction can be represented as:
\[ RCN + R'MgX \rightarrow R-C(=N)R' + MgX \]
- Here, the carbon of the nitrile (C≡N) becomes a carbon bonded to R' and has a double bond with nitrogen (C=N).

3. **Formation of an Imine**:
- The product from the above reaction is an imine (or an intermediate compound) where the nitrogen is still attached to the carbon.
- The structure can be represented as:
\[ R-C(=N)R' \]

4. **Hydrolysis of the Imine**:
- The next step involves hydrolysis, where the imine reacts with water (H2O) in the presence of an acid.
- During hydrolysis, the imine bond (C=N) is broken, and the nitrogen is protonated, while the carbon gets an oxygen from water.
- This reaction can be summarized as:
\[ R-C(=N)R' + H2O \rightarrow R-C(=O)R' + NH3 \]
- The product of this hydrolysis is a ketone (R-C(=O)R') and ammonia (NH3).

5. **Final Product**:
- The final compound obtained from this reaction sequence is a ketone, specifically R-C(=O)R'.

### Conclusion:
The compound formed from the reaction of RCN with R'MgX followed by hydrolysis is a **ketone**.