# How do we describe the "electronic geometry" with respect to SBr_2? (a) "bent"; (b) "trigonal planar"; (c) "tetrahedral"; (d) "octahedral"?

Dec 9, 2016

C

#### Explanation:

There are two bonded species and two lone pair about the central atom $S$. Therefore the bonded species to lone pair ratio is 2:2.

There are four electron cloud about the central about $S$.
The electronic geometry is tetrahedral .

Again, the bonded species to lone pair ratio is 2:2. The molecular geometry is bent. (as you can see from the image you have provided)

Because of the two lone pair about the central atom $S$, the bond angles will be slightly less than 109.5°.

The answer to the question in the image that you have provided is choice c.

Dec 9, 2016

$\text{Option c}$

#### Explanation:

The electron pair geometry, bonding and non-bonding, is TETRAHEDRAL to a first approximation. If you don't grasp why, holler.

However, we describe molecular geometry on the basis of bonding pairs not lone pairs. The lone pairs would compress the $\angle B r - S - B r$ from $109.5$ to approx. ${105}^{\circ}$ because of the repulsive influence of the 2 lone pairs.