Liquid `I_2CI_6` has the structure

Options

A.
B. `[ICl_2]^+[ICI_4]^-`
C. Monomeric T-shaped
D. None of these

Answer

To analyze the structure of the liquid \( I_2Cl_6 \), we can break down the information provided in the video transcript into a step-by-step solution.

### Step 1: Understanding the Molecular Formula
The molecular formula \( I_2Cl_6 \) indicates that the compound consists of 2 iodine (I) atoms and 6 chlorine (Cl) atoms. This suggests a complex structure where iodine and chlorine are bonded together.

**Hint:** Identify the number of atoms of each element in the molecular formula to understand the composition of the compound.

### Step 2: Identifying the Structure
The transcript mentions that \( I_2Cl_6 \) has a specific structure characterized by terminal and bridging bonds. This indicates that some chlorine atoms are bonded directly to iodine atoms (terminal bonds), while others are involved in bridging between iodine atoms.

**Hint:** Look for terms like "terminal" and "bridging" bonds to understand how atoms are connected in the molecule.

### Step 3: Bond Lengths
According to the transcript, the bond lengths for the terminal bonds are around 268 picometers, while the bridging bonds are around 38 picometers. This significant difference in bond lengths suggests that the types of bonds (terminal vs. bridging) have different strengths and characteristics.

**Hint:** Compare the bond lengths to infer the nature of the bonds and their stability.

### Step 4: Bond Angles
The bond angles mentioned are approximately 94 degrees for the \( ICl_2 \) bond and 84 degrees for the bridging bonds. These angles provide insight into the spatial arrangement of the atoms in the molecule.

**Hint:** Use bond angles to understand the geometry of the molecule and how atoms are positioned relative to each other.

### Step 5: Planarity of the Structure
The overall system is described as planar, meaning all the atoms lie in the same plane. This is an important characteristic that can affect the reactivity and physical properties of the compound.

**Hint:** Recognize the significance of planarity in molecular structures and how it can influence chemical behavior.

### Conclusion
The structure of \( I_2Cl_6 \) is characterized by its complex arrangement of terminal and bridging bonds, differing bond lengths, specific bond angles, and a planar configuration. This understanding can help in predicting the chemical properties and reactivity of the compound.

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