Question

Figure 1 of 1

  

Cumulene  

What types of orbital overlap occur in cumulene?  

Check all that apply.  

• S/SP overlap  

• sp²/sp² overlap  

• s/sp² overlap  

• sp/sp overlap  

• s/s overlap  

• p/p overlap  

• sp/sp² overlap  

Answer 1

Concepts and reason

Orbital overlapping concept is used for explaining the concept of bonding between the atoms in the molecules. These overlaps are classified into two types based on their orientation of orbitals in the atoms.

1. End-on-end overlaps, gives a strong sigma $\left( {\rm{\sigma }} \right)$ bond

2. Side-ways overlaps results in the formation of pi $\left( {\rm{\pi }} \right)$ bond; these overlaps are named after their orbitals.

Fundamentals

Hybridization: Hybridization is a concept, which explains the mixing of individual orbitals to get hybrid orbitals that are responsible for bonding.

Hybridization of an atom can be explained by the number of sigma bonds attached to that atom.

Consider carbon atoms in its various hybridized state as shown below:

B

The structure of the cumulene is shown below.

From the given structure, it is clear that there are two different carbon atoms according to the hybridization. Inner carbons are having ${\rm{sp}}$ hybridization while the terminal carbons are having ${\rm{s}}{{\rm{p}}^{\rm{2}}}$ hybridization.

The given compound structure is shown below.

From the structure, it is clear that there are four types of orbital-overlaps present in the structure.

1. ${\rm{s}}{{\rm{p}}^{\rm{2}}}{\rm{ - s }}$ overlaps.

2. ${\rm{s}}{{\rm{p}}^{\rm{2}}}{\rm{ - sp}}$ overlaps.

3. ${\rm{sp - sp}}$ overlaps.

4. ${\rm{p - p}}$ overlaps.

Ans: Part B

The Orbital-overlap occurred in cumulene is shown below.