How many sigma and pi bonds are present in a molecule of cumulene? (Figure 1) Enter the number of sigma bonds followed by the number of pi bonds separated by a comma. What types of orbital overlap occur in cumulene? Check all that apply.

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Sigma bond: It is a type of covalent bond where there is head-on overlapping of orbitals. It is the strongest form of covalent bonding. Sigma bonds can rotate freely.

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Pi bond: It is a type of covalent bond where there is parallel or side-way overlapping of orbitals. The bond is not as strong as a sigma bond. Free rotation is not possible here.

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Cumulene: It is a hydrocarbon having three or more number of consecutive double bonds.

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Covalent bonding is the bonding between two atoms due to the mutual sharing of electrons between them.

The single bond formed between any two atoms is a sigma bond. If multiple bonds are present, it means that one is sigma and the others are pi-bonds.

Hybridization is the mixing of atomic orbitals of different energies to form an equal number of new hybrid orbitals. There are different types of hybrid orbitals.

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• sp

• sp2

• sp3

• sp3d

• sp3d2

• sp3d3


(A)

The number of σ- and π-bonds in cumulene is shown below:

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(B)

The wrong options are given below:

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The right choices are given below:

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Ans: Part A

The number of σ and π-bonds is as follows:

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Part B

The orbital overlaps in cumulene are as follows:

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