When an organic compound contains a halogen along with N and S, halogen can be tested only after boiling the sodium extract with ..........

Explanation

To solve the question regarding the testing of halogens in an organic compound that contains nitrogen (N) and sulfur (S), we need to follow a systematic approach. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understanding the Problem**:
- We have an organic compound that contains halogen, nitrogen, and sulfur. The presence of nitrogen and sulfur can interfere with the detection of halogens.

2. **Preparation of Sodium Extract**:
...