Write the conductivity order of aluminium phosphide, silicon and cadmium sulphide.

Explanation

To determine the conductivity order of aluminum phosphide (AlP), silicon (Si), and cadmium sulfide (CdS), we can analyze the nature of the bonds in these compounds and how their polarity affects conductivity.

### Step-by-Step Solution:

1. **Understanding Conductivity**:
Conductivity in solids is influenced by the type of bonding and the polarity of the bonds present in the material. Generally, materials with more polar bonds tend to have higher conductivity.

2. **Analyzing Aluminum Phosphide (AlP)**:
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