A molecule with the formula has all it's elements from p-block. Element A is rarest, monoatomic, non-radioactive from its group and has the lowest ionization enthalpy value among A, X and Y . Elements X and Y have first and second highest electronegativity values respectively among all the known elements. The shape of the molecule is :
- (A)Square pyramidal✓ Correct
- (B)Octahedral
- (C)Pentagonal planar
- (D)Trigonal bipyramidal
Answer: (A)
Solution
The element that is monoatomic, non-radioactive, rarest in its group and of lowest ionisation enthalpy among the three is xenon; the most electronegative element is fluorine and the next is oxygen, so is . Xenon forms four bonds to fluorine and one to oxygen and keeps a single lone pair, giving six electron domains about it. The lone pair occupies one apex of the octahedral set, leaving the five bonded atoms in a square-pyramidal shape.
JEE Main · 2025 · 02 Apr 2025 · Shift 1 · Single correct option