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NEET CHEMISTRYChemical Bonding and Molecular StructureMedium

Question

In which of the following molecules are all the bonds not equal?

A

ClF3\text{ClF}_3

B

BF3\text{BF}_3

C

AlF3\text{AlF}_3

D

NF3\text{NF}_3

Step-by-Step Solution

In ClF3\text{ClF}_3, the central chlorine atom is sp3dsp^3d hybridised and possesses 3 bond pairs and 2 lone pairs of electrons. According to the VSEPR theory, it adopts a T-shaped geometry derived from a trigonal bipyramidal structure. The two lone pairs occupy the equatorial positions to minimise repulsions. As a result, the two axial Cl-F\text{Cl-F} bonds suffer greater repulsion from the lone pairs and are longer than the single equatorial Cl-F\text{Cl-F} bond. Therefore, all bonds in ClF3\text{ClF}_3 are not equal. Conversely, in BF3\text{BF}_3 (trigonal planar), AlF3\text{AlF}_3, and NF3\text{NF}_3 (trigonal pyramidal), all bonds are equivalent in length.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Chemical Bonding and Molecular Structure. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYChemical Bonding and Molecular Structurefollowingmolecules

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