Which of the following arrangements correctly represents hexagonal and cubic close packed structure respectively ?

Options

A. ABAB……..and ACBACB
B. ABCABC……… and ABAB
C. Both have ABCABC ……………….arrangement
D. Both have ABAB …………arrangement

Answer

To solve the question regarding the correct representation of hexagonal and cubic close packed structures, we can follow these steps:

### Step 1: Understand the Structures
- **Hexagonal Close Packing (HCP)**: This structure has an arrangement where the layers are stacked in an ABA pattern. The first layer is A, the second layer is B, and then the third layer repeats the first layer A.
- **Cubic Close Packing (CCP)**: This structure has an arrangement where the layers are stacked in an ABC pattern. The first layer is A, the second layer is B, the third layer is C, and then the pattern repeats.

### Step 2: Analyze the Options
- We are given options that represent different arrangements. We need to identify which arrangement corresponds to HCP and which corresponds to CCP.
- Look for the patterns in the options provided.

### Step 3: Identify the Correct Arrangement
- **For HCP**: Look for the arrangement that follows the ABA pattern.
- **For CCP**: Look for the arrangement that follows the ABC pattern.

### Step 4: Compare the Options
- In the options provided, we need to check for the arrangements:
- If one option shows ABA for HCP and ABC for CCP, that is the correct answer.
- If both arrangements show the same pattern (like AB, AB), it cannot represent HCP and CCP correctly.

### Step 5: Conclusion
- After analyzing the options, we find that the correct representation is the one that shows ABA for HCP and ABC for CCP.

### Final Answer
- The correct option that represents hexagonal close packing and cubic close packing is **Option 1**.

---