Question

the molecules in the following set do not include which of the following shapes? xef₂, bf₃, brf₃, clo₄⁻ t - shaped trigonal planar trigonal pyramidal linear tetrahedral

Explanation:

Step1: Determine shape of XeF₂

XeF₂ has 2 bonding pairs + 3 lone pairs (total 5 electron domains). Electron geometry is trigonal bipyramidal; molecular shape is linear.

Step2: Determine shape of BF₃

BF₃ has 3 bonding pairs + 0 lone pairs (3 electron domains). Molecular shape is trigonal planar.

Step3: Determine shape of BrF₃

BrF₃ has 3 bonding pairs + 2 lone pairs (5 electron domains). Electron geometry is trigonal bipyramidal; molecular shape is T-shaped.

Step4: Determine shape of ClO₄⁻

ClO₄⁻ has 4 bonding pairs + 0 lone pairs (4 electron domains). Molecular shape is tetrahedral.

Step5: Identify missing shape

The shapes present are linear, trigonal planar, T-shaped, tetrahedral. Trigonal pyramidal is missing.

Answer:

trigonal pyramidal