Square Pyramidal Geometry Molecule | BrF5 | JEE Main Chemical Bonding

Molecule / Ion with Square Pyramidal Geometry

Question:
The molecule / ion with square pyramidal shape is:

(A) PCl5
(B) [Ni(CN)4]2−
(C) PF5
(D) BrF5

Correct Answer: BrF5

Explanation (VSEPR Theory)

In BrF5, the central atom bromine has:

  • 5 bond pairs (Br–F)
  • 1 lone pair

Total electron pairs around bromine = 6

According to VSEPR theory, six electron pairs arrange themselves in an octahedral electron geometry.

Due to the presence of one lone pair, the molecular geometry becomes square pyramidal.

Hence, BrF5 shows square pyramidal shape.

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