Question

Indicate which orbitals overlap to form the σ bond between the carbon atoms in HCCH
a.between an unhybridized s orbital on C and an unhybridized s orbital on the other C
b.between a hybrid sp orbital on C and a hybrid sp orbital on the other C
c.between a hybrid sp2 orbital on C and a hybrid sp2 orbital on the other C

Answer 1

Answer:

The correct option is: b. between a hybrid sp orbital on C and a hybrid sp orbital on the other C

Explanation:

Acetylene is an unsaturated hydrocarbon molecule consisting of two carbon atoms bonded by a triple bond. It has a linear molecular structure.

H-C≡C-H

In this molecule, each carbon atom is sp hybridized and the sp hybridized orbital of one carbon atom overlaps with the sp hybridized orbital of the second carbon atom to form a sigma (σ) bond between the carbon atoms of a acetylene molecule.

Therefore, the sp hybridized orbitals of the two carbon atoms overlap to form a σ bond in an acetylene molecule.

Answer 2

A hybrid sp orbital on C and a hybrid sp orbital on the other C would overlap to form the sigma bond between the carbon atoms in HCCH (Option b).

What are sigma bonds?

Sigma bonds are the type of very strong covalent bond, which are known to nearly overlap atom orbitals.

• Sigma bonds are generated by a head-positive overlap of atomic orbitals between different inter-nuclear axis.

• For instance, methane (CH4) is a well-known compound that forms 4 different C-H sigma bonds.

In conclusion, a hybrid sp orbital on C and a hybrid sp orbital on the other C would overlap to form the sigma bond between the carbon atoms in HCCH (Option b).

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