Which of the following is used as a reductant in order to obtain an alkylamine from a nitroalkanes ?

Options

A. `Al_2 O_3`
B. `Sn + HCI`
C. `Na+C_2H_5 OH`
D. `Zn+Nh_4 Cl`

Answer

To determine which reagent is used as a reductant to obtain an alkylamine from nitroalkanes, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- Nitroalkanes (R-NO2) can be reduced to alkylamines (R-NH2). The process involves the conversion of the nitro group (-NO2) into an amino group (-NH2).

2. **Identifying Common Reductants**:
- Common reductants for this transformation include metals such as platinum (Pt), palladium (Pd), nickel (Ni), and chemical reagents like iron (Fe) in the presence of hydrochloric acid (HCl).

3. **Analyzing the Options**:
- If we consider the options typically provided in questions of this nature, we can identify that:
- **Fe + HCl** is a well-known reductant that can effectively reduce nitroalkanes to alkylamines.
- Other options may include hydrogenation methods using metal catalysts (Pt, Pd, Ni).

4. **Conclusion**:
- The most common and effective reductant for converting nitroalkanes to alkylamines is **Fe + HCl** or hydrogen in the presence of a metal catalyst.

### Final Answer:
The reagent used as a reductant to obtain an alkylamine from nitroalkanes is **Fe + HCl**.

---