Which among the following molecules is (a) involved in sp3d hybridization, (b) has different bond lengths and (c) has…

🧠 Find the molecule satisfying all three conditions: (a) sp³d hybridization, (b) different bond lengths, and (c) lone pair on central atom.

🗺️ Check each candidate:

$\ce{PF5}$: sp³d hybridization ✓; axial P–F bonds are longer than equatorial P–F bonds (different lengths) ✓; no lone pair on P ✗ → fails condition (c)

$\ce{XeF4}$: sp³d² hybridization ✗ (6 electron pairs) → fails condition (a)

$\ce{SF4}$ (see-saw):

• Hybridization: 4 bonds + 1 LP = 5 electron pairs → sp³d ✓
• 2 axial S–F bonds and 2 equatorial S–F bonds: axial bonds are longer than equatorial → different bond lengths ✓
• 1 lone pair on S ✓

All three conditions satisfied ✓

$\ce{XeF2}$: sp³d hybridization ✓ (5 electron pairs: 2 bonds + 3 LP); 3 LP on Xe ✓; but all Xe–F bonds are identical (linear, symmetric) → same bond lengths ✗

$\boxed{\text{Answer: } \ce{SF4}}$