Isomerisation in alkane may be brought about by using-

Options

A. `Al_(2)O_(3)`
B. `Fe_(2)O_(3)`
C. `AlCl_(3)` and `HCl`
D. Concentrated `H_(2)SO_(4)`

Answer

To determine how isomerization in alkanes can be brought about, we will analyze the process step by step.

### Step-by-Step Solution:

1. **Understanding Isomerization**:
Isomerization is a chemical process where a compound is transformed into one of its isomers. In the case of alkanes, this involves rearranging the carbon skeleton to form a different structural isomer.

2. **Identifying the Reagents**:
The question asks for the reagent that can facilitate the isomerization of alkanes. A common method for isomerization involves the use of a catalyst.

3. **Lewis Acid Catalyst**:
Lewis acids are compounds that can accept an electron pair. They are often used as catalysts in various chemical reactions, including isomerization.

4. **Recognizing AlCl3 as a Lewis Acid**:
Among the options provided, AlCl3 (aluminum chloride) is a well-known Lewis acid. It can facilitate the isomerization process by stabilizing carbocations that are formed during the reaction.

5. **Reaction Mechanism**:
- When an alkene (like butene) reacts with HCl in the presence of AlCl3, the Lewis acid (AlCl3) protonates the alkene, forming a carbocation.
- This carbocation can undergo rearrangement (such as a methyl shift) to form a more stable carbocation.
- The rearranged carbocation can then react with a nucleophile (like an alkane) to form the isomerized product.

6. **Conclusion**:
Since AlCl3 is the only Lewis acid catalyst mentioned in the options, it is the correct choice for facilitating isomerization in alkanes.

### Final Answer:
The isomerization in alkanes may be brought about by using **AlCl3** (option C).

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