The correct shape and I–I–I bond angles respectively in I3- ion are:
Chemical Bonding · Class 11 · JEE Main Previous Year Question
The correct shape and I–I–I bond angles respectively in ion are:
- a
T-shaped; 180° and 90°
- b
Distorted trigonal planar; 135° and 90°
- c
Trigonal planar; 120°
- d✓
Linear; 180°
Linear; 180°
🧠 : The central I has 7 valence electrons + 1 (negative charge) = 8 electrons. It forms 2 I–I bonds, using 2e; remaining 6e = 3 lone pairs. Steric number = 2 + 3 = 5 → trigonal bipyramidal electron geometry.
The 3 lone pairs occupy the 3 equatorial positions; the 2 I–I bonds are axial → linear molecular geometry with I–I–I angle = 180°.
⚠️ Trap: "T-shaped" would require 3 bonds + 2 LP (steric number 5 with 2 LP); has only 2 bonds + 3 LP — the 3 LP push the 2 bonds all the way to axial positions, giving linear geometry.
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