Frenkel defect is not shown by:

Options

A. AgBr
B. ZnS
C. KBr
D. AgCl

Explanation

To determine which compound does not exhibit a Frenkel defect, we need to understand what a Frenkel defect is and the conditions under which it occurs.

### Step-by-Step Solution:

1. **Definition of Frenkel Defect**:
- A Frenkel defect occurs in a crystal lattice when a cation (or anion) is displaced from its normal position to an interstitial site, creating a vacancy at its original position. This defect typically occurs in ionic solids.

2. **Conditions for Frenkel Defect**:
- For a Frenkel defect to occur, the cation must be relatively small compared to the anion. This is because a smaller cation can fit into the interstitial spaces between the larger anions without causing significant distortion to the lattice.

3. **Analyzing the Options**:
- We need to analyze the given options to identify which compound does not fit the criteria for exhibiting a Frenkel defect.
- The common compounds to consider include alkali metal halides and other ionic compounds.

4. **Identifying the Incorrect Option**:
- Among the options, if we have KBr (Potassium Bromide), it is important to note that potassium (K⁺) is a relatively large cation compared to other cations like Ag⁺ (Silver) or Zn²⁺ (Zinc).
- Since K⁺ is larger, it cannot fit into the interstitial sites of the lattice structure, thus KBr will not exhibit a Frenkel defect.

5. **Conclusion**:
- Therefore, the compound that does not show a Frenkel defect is **KBr**.

### Final Answer:
**KBr (Potassium Bromide) does not show Frenkel defect.**

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