Question

Compare the molecular geometry, bond lengths, and bond angles of NH3 and NF3. Organize your data in a table; discuss and explain.

1. Compare the molecular geometry, bond lengths, and bond angles of NH3 and NF3. Organize your data in a table; discuss and explain. 2. Compare the dipole moments of PCI and Brfs. Discuss and explain.

Answer 1

.Given two molecules are dH 3 structure Bond Pairs electron = 3 (due to 3d-H lone pair eledrons al I Total electron pairs = 3+1 74 if total electron pairs is 4 than sp3 hybridisation and electron geometry should be tetrahedral. But due to presence of lone pair on nitrogen atom repulsion between lone pair and bond pair occur and so electron geometry is distorted There molecular geometry of a Hz is distorted tetrahedral or pyramidal. due to repulsion bond angle willt also change from normal bond angle of tetrahedron molecule i e 109.5 to 1070 so Bond angle becomes lo7

-H bond length = 1.0A (Bcor there is less repulsion between bond pair and love pair bond length slightly changes and equal to lolo for dra molecule structure of dF3 Bond pairs = 3 lone pairs al Total electron pairs = 3+1=4 Hybridisation is spa and electron geometry would be tetrahedral. since Flourine CE is more electrone- gative than nitrogen (h) So bond Pair electrons Shift towards Flourine atoms and repulsion between bond pairs and lone perirs will be more and electron seometry will be distorted tetrahedral or . Pyramidal. Bond angles due to repulsion becomes eaual to 102 . I due to high repulsion between bond I pairs and love pairs N-E bond

I length is equal to I organization o f data 1.35 in A . table : molecule molecular geometry bond angle bond length lool Ao 143 pyramidal 107° 102 Pyramidas. 135 A