is an interhalogen T-shaped molecule. The number of lone pairs of electrons on A is

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T-shaped geometry arises from 5 electron pairs on the central atom (trigonal bipyramidal electron geometry) with 2 lone pairs occupying equatorial positions.

Step 1 — Electron pair count for T-shaped:
- Bonds: 3 (to B)
- Lone pairs: 2
- Total electron pairs: 5 → trigonal bipyramidal electron geometry

Step 2: The 2 lone pairs occupy equatorial positions, leaving 2 axial and 1 equatorial bond → T-shape.

Lone pairs on A = 2

Answer: 2

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