# Question cda90

Dec 11, 2016

#### Explanation:

In the drawing carbon has four bonds. A single bond to the other carbon and a triple bond to the nitrogen.

A. has only two bonds so can not be the answer
B. has four bonds so could be the answer but there are two s bonds using the s orbital shown Carbon has only one s orbital
C. has only two bonds it show the s orbital being split between two p orbitals The splitting of the s orbital is correct but needs four bonds
D. has four bonds so could be correct and it shows the splitting of the s orbital between the three p orbitals (best answer)
E. has six bonds not four. It shows the splitting of the s orbital between 4 p orbitals Carbon has only 3 p orbitals.

Dec 20, 2016

The electron domain geometry is linear; the σ bond between $\text{C}$ and $\text{N}$
involves c) $\boldsymbol{\text{sp/sp}}$ overlap.

#### Explanation:

Per VSEPR theory, a carbon atom that has two electron domains should have a linear electron geometry. (From StudyBlue)

The molecule will be linear with a bond angle of 180°.

The nitrogen atom also has two electron domains: the lone pair and the triple bond to the carbon.

Linear electron geometry corresponds to $\text{sp}$ hybridization. Since both $\text{C}$ and $\text{N}$ are $\text{sp}$ hybridized, the σ# bond between them consists of $\boldsymbol{\text{sp/sp}}$ overlap.