Libermann nitroso reaction is used for the detection of ........ amines.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Libermann-Nitroso Reaction**:
The Libermann-Nitroso reaction is a chemical test used to identify the presence of certain types of amines. It specifically involves the reaction of amines with nitrous acid (HNO2).

2. **Types of Amines**:
Amines can be classified into three categories: primary (1°), secondary (2°), and tertiary (3°) amines. Each type reacts differently with nitrous acid.

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