JEE Main · 2025 · 28 Jan 2025 · Shift 1 · Chemical Bonding and Molecular Structure

The molecules having square pyramidal geometry are

(A) $BrF_{5}$ & $XeOF_{4}$ ✓ Correct
(B) $SbF_{5}$ & $XeOF_{4}$
(C) $SbF_{5}$ & $PCl_{5}$
(D) $BrF_{5}$ & $PCl_{5}$

Answer: (A)

Solution

B r F_{5}

and

X e O F_{4}

are both

s p^{3} d^{2}

hybridised with one position of the octahedral arrangement occupied by a lone pair (on Br) or by the oxo group's electron density (on Xe), leaving the characteristic square pyramidal shape with the lone pair/oxo group pointing away from the base.

S b F_{5}

and

P C l_{5}

have no lone pair on the central atom and adopt the regular trigonal bipyramidal geometry instead. The square pyramidal pair is

B r F_{5}

and

X e O F_{4}

JEE Main · 2025 · 28 Jan 2025 · Shift 1 · Single correct option

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