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ICl3 is an orange solid that dimerizes in the solid state to form I2Cl6. Based on VSEPR theory, how many Cl-I-Cl bond angles are approximately 90 degrees in the dimeric species I2Cl6? (Neglect minor deviations from ideal angles.)

1. 2
2. 4
3. 6
4. 8

Correct answer: 4

Solution

In I2Cl6 (planar structure), each I is bonded to 2 terminal Cl atoms and 2 bridging Cl atoms, with 2 lone pairs, giving a distorted octahedral (square planar with lone pairs). The Cl_ax-I-Cl_bridge angles are close to 90 deg. There are 2 such angles per I atom and 2 I atoms = 4 total ~90 deg Cl-I-Cl angles.

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