Question

Figure 1 of 1 Cumulene What types of orbital overlap occur in cumulene? Check all that apply. s/sp Overlap sp2/p2 Overlap s/sp2 Overlap sp/sp Overlap s/s Overlap p/p Overlap sp/sp2 Overlap Try Again; 4 attempts remaining

Answer 1

Concepts and reason

The concept used to solve this problem is based upon the orbital overlap.

Head to head overlap leads to the formation of sigma bond and sidewise overlap leads to the formation of a pi bond.

Fundamentals

The overlap of orbitals present on two atoms leads to the formation of a chemical bond between those atoms. This is known as orbital overlap.

The overlap of two s orbitals always leads to the formation of a sigma bond. The overlap of p orbitals leads to the formation of sigma bond (end to end overlap) as well as pi bond (sidewise overlap).

According to valence bond approach, a bond is formed by overlapping of singly occupied orbitals present on two atoms. A hybrid orbital is formed by the mixing of two or more atomic orbitals. Atomic or hybrid orbitals overlap along the internuclear axis to form a sigma bond while a sideways overlap of parallel orbitals forms a pi bond.

The structure of cumulene is shown as follows:

The first carbon atom is ${\rm{s}}{{\rm{p}}^2}$ hybridized. It is bonded to two s orbitals of two hydrogen atoms and one ${\rm{sp}}$ orbital of second carbon atom. The second and third carbon atoms contain only ${\rm{sp}}$ hybridized orbitals. Lastly, the fourth carbon atom is ${\rm{s}}{{\rm{p}}^2}$ hybridized, having similar orbital overlapping as the first carbon atom.

According to the types of orbitals present in cumulene, the types of orbital overlapping that occur in cumulene are ${\rm{s/s}}{{\rm{p}}^2}$ between hydrogen atom and first carbon atom, ${\rm{sp/sp}}$ between third and fourth carbon atoms, ${\rm{sp/s}}{{\rm{p}}^2}$ between first and second carbon atoms, and third and fourth carbon atoms, and ${\rm{p/p}}$ overlap forming pi bonds between corresponding carbon atoms.

Ans:

The types of orbital overlap occurring in cumulene are as follows: