The process of halogenation involves the substitution of a hydrogen atom in an alkane with a halogen atom. This reaction is commonly observed with chlorine, bromine, and iodine. However, acylation is not a process of halogenation of alkanes.

Acylation is a different type of reaction where an acyl group (RCO-) is added to a molecule. It involves the addition of an acyl chloride or an anhydride to a compound. This reaction is typically used in organic synthesis to introduce an acyl group into a molecule.

The halogenation of alkanes, on the other hand, involves the substitution of a hydrogen atom with a halogen atom. This reaction can be achieved through different methods:

1. Chlorination: In this process, chlorine gas (Cl2) is used to replace a hydrogen atom in an alkane. The reaction is typically carried out in the presence of ultraviolet (UV) light or heat. For example, methane (CH4) can be chlorinated to form chloromethane (CH3Cl).

2. Bromination: Similar to chlorination, bromination involves the substitution of a hydrogen atom with a bromine atom. Bromine (Br2) is used as the halogenating agent, and the reaction conditions are similar to chlorination. For example, ethane (C2H6) can be brominated to form bromoethane (C2H5Br).

3. Iodination: Iodination is the process of substituting a hydrogen atom with an iodine atom. Iodine (I2) is used as the halogenating agent, and the reaction conditions are typically more vigorous compared to chlorination and bromination. For example, propane (C3H8) can be iodinated to form iodopropane (C3H7I).

In summary, acylation is not a process of halogenation of alkanes. Halogenation involves the substitution of a hydrogen atom with a halogen atom, such as chlorine, bromine, or iodine. Acylation, on the other hand, involves the addition of an acyl group to a molecule and is used in organic synthesis.